40. You mix 50.0 mL of 0.10 M HCl with 40.0 mL of 0.10 M NaOH. What do you know about the final mixture? A) It will be acidic and have a pH <7. B) It will be basic and have a pH < 7. C) It will be acidic and have a pH > 7. D) It will be acidic and have pH > 7. 41. Bismuth sulfide, BizS3, is an insoluble compound. It dissociates in water following the equation: Bi,S3 (s) = 2 Bi³* (aq) + 3 S² (aq) What is the expression for the Ksp of this substance? A) ksp [Bi3+]?[S?-13 [Bi2S3] B) ksp = [Bi³+]³[S²-]² C) ksp = [Bi3+]²[S²-j3 D) ksp = [Bi3+][S2-1

40. You mix 50.0 mL of 0.10 M HCl with 40.0 mL of 0.10 M NaOH. What do you know about the final mixture? A) It will be acidic and have a pH <7. B) It will be basic and have a pH < 7. C) It will be acidic and have a pH > 7. D) It will be acidic and have pH > 7. 41. Bismuth sulfide, BizS3, is an insoluble compound. It dissociates in water following the equation: Bi,S3 (s) = 2 Bi³* (aq) + 3 S² (aq) What is the expression for the Ksp of this substance? A) ksp [Bi3+]?[S?-13 [Bi2S3] B) ksp = [Bi³+]³[S²-]² C) ksp = [Bi3+]²[S²-j3 D) ksp = [Bi3+][S2-1

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter15: Solutions Of Acids And Bases

Section: Chapter Questions

Problem 15.13QE: Why have chemists not tabulated the fraction ionized for different acids? Such a table would make...

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Consider an aqueous solution of HF. The molar heat of formation for aqueous HF is -320.1 kJ/mol. (a) What is the pH of a 0.100 M solution of HF at 100C? (b) Compare with the pH of a 0.100 M solution of HF at 25C.
Why have chemists not tabulated the fraction ionized for different acids? Such a table would make problems such as calculating the pH of an acid solution quite simple.
Two students were asked to determine the Kb of an unknown base. They were given a bottle with a solution in it. The bottle was labeled aqueous solution of a monoprotic strong acid. They were also given a pH meter, a buret, and an appropriate indicator. They reported the following data: volume of acid required for neutralization = 21.0 mL pH after 7.00 mL of strong acid added = 8.95 Use the students' data to determme the Kb of the unknown base.
Consider the process H2O H+(aq)+OH(aq)H=55.8kJ (a) Will the pH of pure water at body temperature (37C) be 7.0? (b) If not, calculate the pH of pure water at 37C.
You have a solution of the weak acid HA and add some HCl to it. What are the major species in the solution? What do you need to know to calculate the pH of the solution, and how would you use this information? How does the pH of the solution of just the HA compare with that of the final mixture? Explain.
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What is a salt? List some anions that behave as weak bases in water. List some anions that have no basic properties in water. List some cations that behave as weak acids in water. List some cations that have no acidic properties in water. Using these lists, give some formulas for salts that have only weak base properties in water. What strategy would you use to solve for the pH of these basic salt solutions? Identify some salts that have only weak acid properties in water. What strategy would you use to solve for the pH of these acidic salt solutions? Identify some salts that have no acidic or basic properties in water (produce neutral solutions). When a salt contains both a weak acid ion and a weak base ion, how do you predict whether the solution pH is acidic, basic, or neutral?
A solution is made by dissolving 15.0 g sodium hydroxide in approximately 450 mL water. The solution becomes quite warm, but after it is allowed to return to room temperature, water is added to bring the volume to 500.0 mL of solution. (a) Calculate the pH and pOH in the final solution. (b) Why would we wait for it to return to room temperature? (c) If the mass of the water used to initially dissolve the sodium hydroxide were exactly 450 g and the temperature of the water increased by 8.865 C, how much heat was given off by the dissolution of 15.0 g of solute? Assume the specific heat of the solution is 4.184 J/g. K. What is the molar heat change for the dissolution of sodium hydroxide (known as the enthalpy of solution, Hsol)?
For the following, mix equal volumes of one solution from Group I with one solution from Group II to achieve the indicated pH. Calculate the pH of each solution. Group I: 0.20 M NH4Cl, 0.20 M HCl, 0.20 M C6H5NH3Cl, 0.20 M (C2H5)3NHCl Group II: 0.20 M KOI, 0.20 M NaCN, 0.20 M KOCl, 0.20 M NaNO2 a. the solution with the lowest pH b. the solution with the highest pH c. the solution with the pH closest to 7.00