Exam 3 Ch. 16

Front 1

In a solution prepared by dissolving 0.1 mole of propanoic acid in enough water to make 1 L of solution, the Ph is observed to be 2.945. The Ka is

Back 1

1.3x10^-5

yes

Front 2

The OH- concentration in a 2.5x10^-5 M Ba(OH)2 solution is

Back 2

5x10^-3 M

yes

Front 3

Which of the following does not fit the definition of a Bronsted Base?

Back 3

NH4+

yes

Front 4

For weak acid, HX, Ka= 7.3x10^-6. Calculate the pH of a 0.59 M solution of Hx

Back 4

2.68

yes

Front 5

Which of the following is a conjugate acid/base pair?

Back 5

more than one of these

no

Front 6

Calculate the pOH of a 4.6 M solution of HCl

Back 6

-0.66

no

Front 7

Which of the following substances is never a Bronsted-Lowry acid in aqueous solution?

Back 7

sodium acetate, NaCH2CO2(s)

yes

Front 8

What is the concentration of H+ in a 2.5 M HCl solution?

Back 8

2.5 M

yes

Front 9

Which of the following chemical equations corresponds to the base ionization constant, Kb, for hydrogen sulfite ion (HSO-3)?

Back 9

HSO3-(aq) + H2O (l) = H2SO3 (aq) + OH- (aq)

yes

Front 10

Which one of these salts will form a basic solution on dissolving in water?

Back 10

KCN

yes

Front 11

Which of the following is the equilibrium constant expression for the dissociation of the weak acid HOCl?

Back 11

K = ([H+][OCl-]) / ([HOCl])

yes

Front 12

A 0.14 M HNO2 solution is 5.7% ionized. Calculate the H+ ion concentration

Back 12

8x10^-3 M

yes

Front 13

Calculate the pH of a 0.75 M HOCl solution (pKa = 7.46)

Back 13

3.79

yes

Front 14

If the ionization constant of water, Kw, at 40* C is 2.92x10^-14, then what is the hydronium ion concentration and pH for an acidic solution?

Back 14

[H3O+] > 1.71 x 10^-7 M and pH < 6.77

yes

Front 15

The pH of aqueous 0.35 M hypobromous acid, HBrO, is 4.53. What is the Ka of this acid?

Back 15

2.5E-9

yes

Front 16

What is the pH of 0.492 M aqueous ethylamine?

Back 16

0.308

no

Front 17

Aniline is an industrially important amine used in the making of dyes. Determine the pH of an aniline solution made by dissolving 3.9 g of aniline in enough water to make 100 mL of solution.

Back 17

9.13

yes

Front 18

What is the pH of 0.109 M HCl(aq) at 25*C?

Back 18

0.963

yes

Front 19

Molecules or ions that can alternately behave as either a Bronsted-Lowry acid or base are called:

Back 19

amphiprotic

yes

Front 20

Which Bronsted-Lowry acid has the strongest conjugate base?

Back 20

HF

yes

Front 21

In the following chemical equation indicate the reaction that is Bronsted-Lowry acid:

HCN(aq) + H2O(l) = H3O+(aq) + CN(aq)

Back 21

HCN

yes

Front 22

What is the strongest monoprotic acid of the following set if all acids are at 0.1 M concentration?

Back 22

hydrofluoric acid with Ka = 3.5x10^-4

yes