Quiz 7 Multiple Choice

What is the pH for a 5 x 10-5 M OH- solution?

9.70

Which of the following is INCORRECT for Brønsted-Lowry acids and bases?

CH3CN is a protic solvent

The molar solubility of a saturated iron(II) carbonate solution derived from the Ksp value is 5.6 x 10-6 M. The molar solubility is greater than 5.6 x 10-6 M when accounting for additional reactions. Which of the reactions below will not increase the solubility of iron(II) carbonate?

FeOH+ (aq) + OH- Fe(OH)2 (s)

All of the following are strong acids, except:

HF

Which statements below are TRUE for enthalpy and entropy? I Enthalpy is the heat flow, q, under constant applied pressure. II Standard conditions for entropy and enthalpy changes are 1 M concentration, 1 bar pressure and 298.15 K. III The entropy change for a system is the amount of energy, at a given temperature, that is dispersed into motion of the molecules in the system. IV When the value of ΔH is negative, heat is released. When the value of ΔS is negative, entropy is increased.

I, II, and III

For the reaction HCN (aq) + H2O (l) ↔ CN- (aq) + H3O+ (aq), all of the following will shift the equilibrium toward the products, except: I adding HCN. II adding H2O. III removing CN-. IV removing H3O+.

II) adding H20

When the direction for a reaction is reversed the new value of K is:

K'= 1/K

For a triprotic acid, which of the following is NOT true?

Ka1Kb2=Kw

Which of the classes of acids and bases and strength have been incorrectly matched?

R4NOH: weak base

The pH of a solution is 9.65. The solution is ____________________ and the hydroxide concentration is _________________ than the hydronium concentration.

basic; greater

For the reaction aA (aq) + bB (s) ↔ cC (l) + dD (g), all of the statements below are TRUE, except:

concentrations of pure solids, pure liquids and solvents are omitted because they are negligible

A student attempts to separate Cl- and I- from a solution that is 0.05 M Cl- and 0.10 M I- with Pb(NO3)2. As Pb(NO3)2 is added, which anion will precipitate first and what will the concentration of the anion be when the second anion begins to precipitate? Ksp = 1.7 x 10-5 for PbCl2 and Ksp = 9.8 x 10-9 for PbI2.

iodide precipitates first; 0.0012 M iodide

Nickel forms three complexes with hydroxide, NiOH+ (aq), Ni(OH)2 (aq) and Ni(OH (aq). Which statement(s) regarding the impact of complex formation on the solubility of nickel hydroxide are FALSE? I Hydroxide behaves as a Lewis acid when forming a complex with nickel. II The total nickel concentration is [Ni2+]tot = [Ni2+] + [NiOH+] + [Ni(OH)2] + [Ni(OH]. III As [OH-] increases, the solubility of Ni(OH)2 initially decreases but then increases. IV

only I- hydroxide behaves as a Lewis acid when forming a complex with Nickle

For a reaction with a ΔHo = +50 kJ and a ΔSo = +100.0 J/K, ΔGo is _______________ and the equilibrium constant is _______________. The temperature of this reaction is greater than 600 K.

positive, less than 1

In which solution is solubility of silver chloride the largest?

pure water