is the solution of nh4f acidic, basic or neutral

How to tell which packages are held back due to phased updates. NH4F is a salt of weak acid HF (Ka = 7.2 104) and weak base NH4OH (Kb = 1.8 105), the solution of NH4F will be ______. Zone Bars are in fact gluten free. Making statements based on opinion; back them up with references or personal experience. Need help with something else? https://www.thinglink.com/scene/636594447202648065 ACID ( wikipedia) An acid is a molecule or ion capable of donating a hydron (proton or hydrogen ion H+), or, alternatively, capable of forming a covalent bond with an electron pair (a Lewis acid). Salt. A:To calculate, we would use the given information . NH4 Ka 5.6x10-10 The Acid Is Stronger Than The. KBr acidic. what is the concentration of H3O+ in this, Q:7. Q:Which is a stronger acid in aqueous solution, HF or HCl, and why? Your question is solved by a Subject Matter Expert. Did this satellite streak past the Hubble Space Telescope so close that it was out of focus? RbOC1, KI, Ba(ClO4),, and NH4NO3. It's just a hydrogen-bonded complex that happens to retain some semblance of existence in the solid. Q:Calculate [OH] for the following solution; First, use litmus paper to test the pH of the salt solution. Question = Is SiCl2F2polar or nonpolar ? Solved Determine whether the following salts would create an - Chegg Salts that produce Basic solutions . Acidic b. Will NH4F be acidic, basic or neutral in water? GIven: pKb - YouTube It is fairly stable: mp $\pu{126 C},$ bp $\pu{240 C}$ (with decomposition). c . Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The water, A:a) Since the acid which will dissociate more will be more stronger acid [H+]=4.01104Mb. A:Acid-base concept can be explained by various theories :- The same way that polyprotic acids lose H. Predict whether the pH of each of the following salts placed into water is acidic, basic, or neutral. These are purple in color. The color chart that comes with the indicator will show you whether the solution is acidic, basic, or neutral. The ionization, Q:Hygrogen cyanide gas (HCN), a power respiratotoxic, inhibitor, is highly toxic. Looking for Ron Prestridge online? The traditional method of making cotton candy involves spinning sugar, Read More Does Cotton Candy Have Dairy?Continue. Open in App . Consider three solutions, R, Z, and Q. Solution R has[ H+ ]=0.0134. Report. The easiest way to tell if a solution is acidic or basic is by using a pH indicator strip. H2S It's still just a salt. . If so, it can be a Lewis base. Determine if the solution formed by each salt is acidic, basic, or neutral. 9tth ed. 1 mole of HCN reacts with 1 mole of NaOH, Q:Consider the following three compounds: propane, BBr3, and H2S. Will NH4F be acidic, basic or neutral in water? A, Q:Coleiro-ic Acid, HColeiro , is a new organic compound used to manufacture hypnotic drugs and some, Q:1. One last point - the statement should be "sodium sulfate a neutral salt in aqueous solution. (a) What is theconjugate acid of hydroxylamine? H3PO4) its a bit more complicated and we need to use Ka and Kb to determine the pH of the resulting solution.More chemistry help at http://www.Breslyn.org. Polar "In chemistry, polarity i An acid is a molecule or ion capable of donating a, In chemistry, bases are substances that, in aqueous solution, are slippery to the touch, taste astringent, change the color of. For example, red cabbage juice can be used as an indicator because it changes color from purple to pink in the presence of an acid and changes color from purple to green in the presence of a base. a) slightly acidic b) slightly basic c) strongly basic d) neutral vi) The theory which explain amphoteric nature of water is a) Arrhenius theory b) Lewis theory SC. NH4F is a salt of weak acid HF (Ka = 7.2 104) and weak base NH4OH (Kb = 1.8 105), the solution of NH4F will be slightly acidic. This means the Kb will be very small. C. strongly basic. Hydroxylamine accepts protons from water and forms a, Q:Write a net ionic equation to show that ascorbic acid, H2C6H6O6, behaves as an acid in water., Q:Vhich of the following substance/substances yield a basic solution when dissolved in Chapter 3: Ionic Equilibria - Multiple choice questions Q 5 Q 4 Q 6 NH4 Ka 5.610-10 The acid is stronger than the base, so the solution will be slightly acidic. Now, NO3- won't attract an H+ because it is usually from a strong acid. It is made, A:Substances are classified into acidic or basic based on their nature. . What is the conjugate base of H2NNH3+? NH4 Ka 5.6x10-10 The acid is stronger than the base, so the solution will be slightly acidic. Well, there are, No, cotton candy does not have dairy. 22. The volcanoes on Maui are constantly erupting and the lava that comes out of them is very dark. This is known as the pH scale and is the range of values from 0 to 14 that describes the acidity or basicity of a solution. Therefore the acid strength here is slightly higher than the base strength. salt. Your email address will not be published. Get a free answer to a quick problem. What, A:Givendata,Molarityofbutylamine=0.47MpH=12.13, Q:Amethocaine,C15H25N2O2Cl, is the salt of the basetetracaineandhydrochloric acid. Answer : NH4F ( AMMONIUM FLUORIDE ) is acid What is an acid, base, neutral ? Kb for NO2- is 1.00 x 10^-14 / 4.5 x 10^-4 = 2.2 x 10^-11. Any combination of these anions and cations will produce neutral solutions. Click hereto get an answer to your question NH4CN is a salt of weak acid HCN (Ka = 6.2 10^-10) and a weak base NH4OH(Kb = 1.8 10^-5) . If it turns blue, the salt is basic. If pH = 7, then the solution is neutral. Ammonium fluoride | NH4F - PubChem This is because stronger, Q:Butylamine, C4H9NH2, is a weak base. Why did Ukraine abstain from the UNHRC vote on China? Our patient has a pH of 7.35. Ammonium fluoride - Wikipedia Get access to millions of step-by-step textbook and homework solutions, Send experts your homework questions or start a chat with a tutor, Check for plagiarism and create citations in seconds, Get instant explanations to difficult math equations, Chemical equilibrium and ionic equilibrium are two major concepts in chemistry. In the sublimation, the salt decomposes to ammonia and hydrogen fluoride, and the two gases can recombine to give ammonium fluoride, i.e. (a) SrCl2 (b) AlBr3 (c) CH3NH3NO3 (d) NaCHO2 (e) NH4F Determine if the solution formed by each salt is acidic, basic, or neutral. Experts are tested by Chegg as specialists in their subject area. See https://cen.acs.org/safety/lab-safety/Chemists-continue-forget-safety-concerns-about-sodium-hydride/97/web/2019/08 for more detail. Recommended textbook solutions. To start, add a small amount of the phenol red indicator solution to your container. Is the solution of NH4F acidic basic or neutral? Another way to test for acids and bases is with indicators. 6. Answer = if4+ isPolar What is polarand non-polar? Why is the solution of ammonium bifluoride more acidic than aqueous Aqueous Solutions of Salts is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by LibreTexts. First week only $4.99! (a) Al(NO3)3 - To learn more, see our tips on writing great answers. \[\ce{H2CO3(aq) + H2O(l) <=> H3O^{+}(aq) + HCO^{-}3(aq)} \nonumber\], \[\ce{HCO^{-}3(aq) + H2O(l) <=> H3O^{+}(aq) + CO^{2-}3(aq)} \nonumber \]. Consider 0.25 M solutions of the following salts: NaCl. It is also used for preserving wood, as a mothproofing agent, in printing and dyeing textiles, and as an antiseptic in breweries. If the salt comes from a STRONG acid and weak base, the pH will be acidic (<7), If the salt comes from s STRONG base and a weak acid, the pH will be basic (>7), If the salt comes from a STRONG acide and a STRONG base, the pH will be neutral (7), LiNO2 which comes from a strong base (LiOH) and a weak acie (HNO2). + 20 For unlimited access to Homework Help, a Homework+ subscription is required. "126$^0$ C" reads as "one hundred twenty-six to the power of zero coulombs". First of all, we know a few things: Take for example dissociation of $\ce{H2CO3}$, carbonic acid. Keeping it similar to the general acid properties, Arrhenius acid also neutralizes bases and turns litmus paper into red. Median response time is 34 minutes for paid subscribers and may be longer for promotional offers. - LiOH These strips will change color depending on the acidity or basicity of the solution. Calculate the percent ionization of a .085 M solution of nitrous acid (weak), with a pH of 3.71. San Francisco: Pearson Education, 2007. and indicate whether the solution is acidic or basic. What is the final pH of a solution that has 0.123M of NH4F? What is the conjugate acid of NO2? Salt has a pH of around 5.5, which means it is slightly acidic. GIven: pKb NH3=4.75. For oxyacids, how does acid strength depend on a. the strength of the bond to the acidic hydrogen atom? Although these hazards have been known for fifty years, it appears that use of NaH with these solvents is common, judging from the large number of published syntheses that use them together. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. OneClass: Will NH4F be acidic, basic or neutral in water? GIven: pKb N The extent of, Q:What is the pH of a 1.8x10 molar aqueous nitric acid solution? HC7H5O2. Is SbCl5 ( Antimony pentachloride ) polar or nonpolar ? Can I tell police to wait and call a lawyer when served with a search warrant? a). - all of, A:According Arrhenius base is define when substance dissolved aqueous solution it's release OH- ions. rev2023.3.3.43278. Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste. NH4CN is a salt of weak acid HCN (Ka = 6.2 10^-10) and a weak base Small Laser Controlled Area Improves Lab Utility and Reduces Costs. The word "neutral" is sometimes added to "ammonium fluoride" to represent the neutral salt[NH 4]F vs. the "acid salt" (NH 4 HF 2). A:By taking a simple example , the general for the ionization of weak acid in water , Answer = SCl6 is Polar What is polarand non-polar? The solution containing a salt of strong acid and weak base is acidic. Ka for NH4+ is 1.00 x 10^-14 / 1.8 x 10^-5 = 5.6 x 10^-10. Although these hazards have been known for fifty years, it appears that use of NaH with these solvents is common, judging from the large number of . HNO2. Are there lone pairs of electrons on the central atom? Rebecca Tefera 2:45pm An aqueous solution of NH4F is acidic. Ionic equilibri. Video Explanation Was this answer helpful? Because, of course, all these salts come from an acid + a base. If you want to know whether a salt is acidic or basic, there are a few simple tests you can perform. (Get Answer) - Is the solution of NH4F acidic, basic or neutral? o But they can be handled the exact same way as other salts, just with a bit more math. Where does this (supposedly) Gibson quote come from? Join / Login >> Class 11 >> Chemistry . The reactants are composed of the salt and the water and the products side is composed of the conjugate base (from the acid of the reaction side) or the conjugate acid (from the base of the reaction side). What is the pH of a solution if it has a hydronium ion concentration of 2.5 1 0 10 M? Maui is one of the most beautiful places on Earth. A salt can be made of either a weak acid and strong base, strong acid and weak base, a strong acid and strong base, or a weak acid and weak base. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Salt solution A salt may be labelled acidic when it contains a H group, and a basic salt contains a OH group. If pH > 7, then the solution is basic. strongest to weakest, at 25 C. To do this test, you will need: (Hint : In each case, draw the Lewis electron dot structure of the molecule or ion. So only the first step will be completed here. How would you describe the pH of the gastric juice? Solved 1. What is the hydronium ion concentration in an | Chegg.com The easiest way to tell is to look at each salt and determine how it was made, i.e. KaHF=6.6*10^-4. Basic c. Neutral. pH is neutral (7), KCN which comes from a strong base (KOH) and a weak acid (HCN). For those who are not familiar with Zone Bars, they are a type of protein bar that is marketed as being beneficial for weight loss and body composition. It is often referred to as fairy floss in Australia and candy floss in the United Kingdom. Question = Is C2H6Opolar or nonpolar ? Determine whether aqueous solutions of the following salts are acidic, basic, or neutral: (a) KBr (b) NaHCO3 (c) NH4Cl (d) Na2HPO4 (e) NH4F Also, how would I know what the products are for these reactions. HS. See attached figures. Cotton candy is a type of confectionery that is made from sugar. For each salt, indicate whether the solution is acidic, basic, or neutral. Find Instagram, Twitter, Facebook and TikTok profiles, images and more on IDCrawl. Answers A - C Giving reasons, predict whether the aqueous solutions of the following compounds are $\pu{0.1 M});$ you get a $\mathrm{pH}\approx 1$. Will these salts produce acidic, basic, or neutral solutions in water Explain why? 15K views 2 years ago To tell if NH4I (Ammonium iodide) forms an acidic, basic (alkaline), or neutral solution we can use these three simple rules along with the neutralization reaction. A:An acid dissociation constant, Ka is the equilibrium constant for a chemical reaction, basically the, Q:Show, using equations for each, how according to the Bronsted-Lowry theory, the hydrogen sulfate, A:Given, Is the solution neutral, acidic, or basic? Na2CO3 Is Milk of Magnesia acidic, basic, or neutral? Which of the following is/are true regarding a 0.1 M solution of Ba(OH)2? While Na+ will not hydrolyze, OCl- will (remember that it is the conjugate base of HOCl). Acids, Bases and Salts OH MY!!! Flashcards | Quizlet What percentage of the amine is protonated if the pH of a, A:Assuming the amine is B. Because this reaction produces OH-, the resulting solution will be basic and cause a pH>7. 16.84 Predict whether aqueous solutions of the following sub- The "parent" base is KOH (a strong base), and the "parent" acid is HCl (a strong acid). Then, slowly add the salt solution to the container while stirring. HF is stronger acid than NH4+, is not it ? If pH < 7, then the solution is acidic. To test with litmus paper, wet the paper with the salt solution and then compare the color of the paper to the chart included with the litmus kit. Basic b. Alkaline c. Both d. Neither. $OCl^-_{(aq)} + H_2O_{(l)} \rightleftharpoons HOCl_{(aq)} + OH^-_{(aq)}$. New Questions About Fantasy Football Symbols Answered and Why You Must Read Every Word of This Report. Identify each as a Lewis acid, base,, A:Lewis acids are those substance which are having deficiency of electron in completing the octet and, Q:The following boxes represent aqueous solutions containinga weak acid, HA and its conjugate base,, A:pH=It is defined by saying that a measurement of the level of acid or alkali in a substance., Q:The ?b for an amine is 2.755105. Christopher Wu (UCD), Christian Dowell (UCD), Nicole Hooper (UCD). In a particular solution, acetic acid is 11% ionized at 25 C. Calculate the pH of the solution and the mass of acetic acid dissolved to yield 1.00L of solution. NH4 Ka 5.6x10-10 The Acid Is Stronger Than The Base, So The Solution Will Be Slightly Acidic. 2003-2023 Chegg Inc. All rights reserved. pH is basic (>7), LiNO3 which comes from a strong base (LiOH) and a strong acid (HNO3). Choose an expert and meet online. \[NH_4NO_{3(s)} \rightarrow NH^+_{4(aq)} + NO^-_{3(aq)}\]. All of the rules from above still apply. Which pH has the highest acidity, Q:Rank the following in terms of basicity (base strength) from The pH will remain neutral at 7. Thanks for contributing an answer to Chemistry Stack Exchange! Upper Saddle River, NJ: Pearson Prentice Hall, 2007. d). acidic,, A:Given aqueous solutions https://en.wikipedia.org/wiki/Base_(chemistry), https://en.wikipedia.org/wiki/Salt_(chemistry), https://en.wikipedia.org/wiki/Neutralization_(chemistry). Aqueous Solutions of Salts - Chemistry LibreTexts However, some common methods include using litmus paper or an indicator solution. Step 1: $NaOCl _{(s)} \rightarrow Na^+_{(aq)} + OCl^-_{(aq)}$. F hydrogen bonds between the anions and cations. Acid or base or, Q:a) Is an aqueous solution that is 0.10 M Na2S (aq) likely to be acidic, basic or pH neutral?, Q:The pHpH of a 1.00 MM solution of caffeine, a weak organic base, is 12.300. Arrhenius acid act as a good electrolyte as it dissociates to its respective ions in the aqueous solutions. Predict if the solutions of the following salts are neutral, acidic or How to analyze a acid and salt mixture using titrimetry? (i) HCl Is the solution basic at 25C? Aluminium has 6 electrons in its valence shell, and, Q:Predict ionization of the following drug as a function of pH. Sodium hydride decomposes certain solvents-violently. No packages or subscriptions, pay only for the time you need. - H2O Its also one of the brownest. (iv) NH4OH, Q:4 Acidic b. If the solid ammonium fluoride (NH4F) is dissolved in pure water, will the resulting solution be acidic, basic, or neutral? If the solution isbasic, the strip will turn blue or purple. Timberlake, Karen C. Chemistry 101 Introductory Chemistry. GIven: pKb NH3=4.75. Petrucci, Ralph H., William S. Harwood, F G. Herring, and Jeffry D. Madura. pH is basic (7). (K (NH3) = 1.76 x 10-5, Ka (HF) = 6.8 x 10-4) Drag the appropriate items to their respective bins. c). Question: Determine whether the following salts would create an acidic, basic, or neutral solution. Acetic acid, HC2H3O2 hydrochloric acid (HCl) only Calculate the pH of a solution in which [H3O+]=9.5109M. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. [H3O+] = 1.8x10-10M Q:Determine whether solutions of the following salts are acidic, basic, or neutral at 25oC: (a), A:Given : The approximate $\mathrm{pH}$ can be calculated from the ionization constant of $\ce{HF}$ and the concentrations of $\ce{NH4F}$ and $\ce{HF}.$. Is it correct to use "the" before "materials used in making buildings are"? AlBr3 NH4F CH3NH3NO3 NaCHO2 acidic basic neutral. (a) Calculate the[H3O+], pH, [OH]and. Is this based on the periodic table? HSO 4-, the conjugate base of the strong acid, H 2 SO 4, is an exception. An article in the American Chemical SocietysChemical & Engineering News newsmagazine draws attention to the hazard posed by sodium hydride when used in certain polar aprotic solvents such as dimethylsulfoxide (DMSO) and dimethylformamide (DMF). the reaction is reversible: This substance is commonly called "commercial ammonium fluoride". Answer = C2H6O is Polar What is polarand non-polar? J.R. S. If the salt comes from a STRONG acid and weak base, the pH will be acidic (<7) If the salt comes from s STRONG base and a weak acid, the pH will be basic (>7) Luckily, since we're dealing with acids, the pH of a salt of polyprotic acid will always be greater than 7. (a) SrCl2 (b) AlBr3 (c) CH3NH3NO3 (d) NaCHO2 (e) NH4F Question Do I need a thermal expansion tank if I already have a pressure tank? This is known as a hydrolysis reaction. ) NaCN (ii) HF, A:NaCN + H2O ------> NaOH(aq) + HCN(aq) To make coconut puree, start by removing the meat from a fresh coconut. How to match a specific column position till the end of line? The easiest way to tell is to look at each salt and determine how it was made, i.e. If it turns blue, the salt is basic. Will NH4F be acidic, basic or neutral in water? Answer = IF4- isNonpolar What is polarand non-polar? Making educational experiences better for everyone. answered 04/08/21, Ph.D. University Professor with 10+ years Tutoring Experience. pH is basic (>7). It is a very weak, A:HCN reacts with NaOH as follows: An Aqueous Solution Of NH4F Acidic, Basic, Or Neutral? To think about a different example acetic acid is a weaker acid, $\text{pK}_\text{a} = 4.76$, so the acetate anion is a stronger base than the sulfate anion. Is the. a) IP = k sp b) IP > k sp c) IP < k sp d) IP << k sp v) NH4F is a salt of weak acid HF ( ka = 7.2 x 10-4) and weak base NH4OH (Kb = 1.8 x 10-5), the solution of NH4F will be ER. The gastric juices in my stomach have a pH between 1 and 2. The base is, Q:Consider the base hydroxylamine, NH2OH. It is is salt of weak base (Al(OH)3), Q:Chlorobenzene, CHCl, is a key intermediate in the manu-facture of dyes and pesticides. b. the electronegativity of the element bonded to the oxygen atom that bears the acidic hydrogen? If the paper turns red, the salt is acidic. Note: For NH3, Kb = 1.8 10-5; for HF, Ka = 7.2 10-4. There are a few ways to test whether a salt is acidic or basic without pH. Does the central atom lack an electron pair? [H+]=5.43109M. Question = Is IF4-polar or nonpolar ? 0:00 / 5:57 Will these salts produce acidic, basic, or neutral solutions in water? neutral. A link to the app was sent to your phone. Science Chemistry Determine if the solution formed by each salt is acidic, basic, or neutral. It is only applicable for, Q:Determine whether aqueous solutions of the following salts are acidic, basic or neutral: If so, it can behave as a Lewis acid.) Let's try this: I corrected the answer a bit, and once you have some spare time, feel free to review the edits, maybe also by (re)visiting. HCN+NaOHNaCN+H2O There is no one definitive way to test whether a salt is acidic or basic. The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. (For polyatomic species, consider the Lewis acid behaviour. (8 pts) a. HCl and CH3CO2H b. HNO3 and Ca(NO2)2 c. H2CO3 and . Why is the solution of ammonium bifluoride more acidic than aqueous ammonium fluoride? The best answers are voted up and rise to the top, Not the answer you're looking for? KI-neutral. \[\dfrac{x^2}{0.2-x}=\dfrac{1*10^-14}{3.98 \times 10{-13}}\]. (a) [ OH ]=0.1M(b) [ OH ]=[ Ba2+ ](c) pH=13.30(d) [ H+ ]=11 0 7 M. Suppose you have 557 mL of 0.0300 M HCl, and you want to make up a solution of HCl that has a pH of 1.751. Solved Determine if the solution formed by each salt is - Chegg Q:Which of the following is a feature of a Lewis acid? See Answer Question: Determine if the solution formed by each salt is acidic, basic, or neutral. The equation for NH4I is:HI + NH3 = NH4IIt is also useful to have memorized the common strong acids and bases to determine whether NH4I acts as an acid or base in water (or if it forms a neutral solution).Strong acids: HCl, H2SO4, HNO3, HBr, HI, HClO4Weak acids: HF, CH3COOH, H2CO3, H3PO4, HNO2, H2SO3Strong Bases: LiOH, NaOH, KOH, Ca(OH)2, Sr(OH)2, Ba(OH)2Weak Bases: NH3, NH4OHNote that we are talking about whether NH4I is an acid, base, or neutral when dissolved in water.- Salts of strong bases and strong acids: pH will remain neutral at 7.- Salts of weak bases and strong acids: pH less than 7 (acidic).- Salts from strong bases and weak acids: pH greater than 7 (alkaline).Based on these rules, the solution of NH4I dissolved in water is acidic.For polyprotic acids (e.g. Calculate the [OH-] in each of the following solutions. We reviewed their content and use your feedback to keep the quality high. Explanation: To find the pH of a salt solution, one has to find the relative strength of the conjugated acid-base pair of the solution. Acids are our substances with, Q:Assume each salt below is dissolved in water to make a 1M solution. It also has a beautiful grain pattern that can add a unique look to your kitchen. It is made, A:The species which are electron rich and hence,have the capability to donate the electrons are known. HF + H2O ------> H+(aq) + F-(aq) Because, of course, all these salts come from an acid + a base. (K(NH3) = 1.76 x 10-5, Ka (HF) = 6.8 x 10-4) Drag the appropriate items to their respective bins. O a. When it comes to identifying a basic salt, there are several key characteristics that you can look for. Solution for Determine whether aqueous solutions of the following salts are acidic, basic, or neutral: (a) KBr (b) NaHCO3 (c) NH4Cl (d) Na2HPO4 (e) NH4F Also, a. Ionic equilibrium deals with the equilibrium involved in an ionization process while chemical equilibrium deals with the equilibrium during a chemical change. It changes color in, Q:Except for the Na spectator ion, aqueous solutions of CHCOOH and CHCOONa contain the same, A:Weak acid dissociates partially in an aqueous solution to furnish the hydrogen ions. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? Learn more about Stack Overflow the company, and our products. Recovering from a blunder I made while emailing a professor. (Hint: The H,0* due to the water, Q:a basic solution contains 0.0004 M hydroxide ions. Combine the solutions and the $\mathrm{pH}$ will settle out somewhere between $1$ and $7,$ because of the common ion effect: $\ce{F-}$ from the $\ce{NH4F}$ inhibits the ionization of $\ce{HF},$ but the solution is still acidic. Other ion = Cl- b), A:Hydrolysis of salt produces acid and base.