Acid-Base Equilibria Part II

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Chemistry the central science chapter 16 calculation questions. Practice/review test. Part 2.

What is the concentration (in M) of hydroxide ions in solution at 25.0 C with pH = 4.282?

Decibel 1.91

A 7.0 x 10^-3 M aqueous solution of Ca(OH)2 at 25.0C has a pH of _________.

12.15 (red egg)

Using the data in the table, which of the conjugate bases below is the strongest base?

OAc-

The Ka for HCN is 4.9 x 10^-10. What is the value of Kb for CN-?

Quint 2.0 (2.0 x 10^-5)

A 0.1 M solution of _______ has a pH of 7.0.

NaNO3

What is the pH of an aqueous solution at 25.0C in which [H+] is 0.0025 M?

2.60 (indigo)

The Ka of hydrazoic acid (HN3) is 1.9 x 10^-5 at 25.0C. What is the pH of a 0.35 M aqueous solution of HN3?

2.59 (blue igloo)

A 0.15 M aqueous solution of the weak acid HA at 25.0C has a pH of 5.35. The value of Ka for HA is _______.

Decibel 1.3

A 0.1 M aqueous solution of _________ will have a pH of 7.0 at 25.0C.

KCl

Of the following which is the weakest acid?

HIO

Of the following acids __________ is not a strong acid.

HNO2

Classify the following compounds as weak bases (W) or strong bases (S): ammonia fluoride ion sodium hydroxide

WWS

The molar concentration of hydroxide ion in pure water at 25.0C is _________.

1.0 x 10^-7

What is the pH of a 0.015 M aqueous solution of barium hydroxide?

12.48 (green hat)

Using the data in the table, which of the conjugate bases below is the weakest base?

F-

The Ka of hypochlorous acid (HClO) is 3.0 x 10^-8 at 25.0C. What is the % ionization of hypochlorous acid in a 0.015 M aqueous solution of HClO at 25.0C?

0.14

HA is a weak acid. Which equilibrium corresponds to the equilibrium constant Kb for A-?

A-(aq) + H20 (l) (double arrows) HA(aq) + OH-(aq)

The acid dissociation constant at 25.0C for hypochlorous acid (HClO) is 3.0 x 10^-8. At equilibrium, the molarity of H3O+ in a 0.010 M solution of HClO is ______________.

Quint 1.7

In the gas phase reaction below, NH3 is acting as a(n) ______________ base but not as a(n) ____________ base.

Lewis, Arrhenius

A- is a weak base. Which equilibrium corresponds to the equilibrium constant Ka for HA?

HA(aq) + H2O(l) (double arrows) H3O+(aq) + A-(aq)

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