Free Printable conjugate acids and bases, pH and pOH

1.

An Arrhenius acid must contain ___ and ionize to produce ___.

a)

hydrogen ions; a solution with a pH greater than 7

b)

hydrogen; hydrogen ions

c)

hydroxide ion; hydroxide ions

d)

hydroxide ion; a solution with a pH greater than 7

2.

According to Brønsted-Lowry theory of acids and bases, a base is ___.

a)

a proton acceptor

b)

a proton donor

c)

a compound that dissolves in water to produce OH^-

d)

an electron donor

3.

The conjugate base of H₂SO₄ is ___.

a)

H₂SO₃

b)

HSO₄^-

c)

H₃SO₄⁺

d)

SO₄^-2

4.

In the reaction represented by $H_2C_2O_4+CH_3NH_2\ \ \rightarrow\ \ HC_2O_4^-+CH_3NH_3^+,$ Which of these is a conjugate acid to the base $CH_3NH_2$ ?

a)

None

b)

$H_2C_2O_4$

c)

$CH_2NH_3^+$

d)

$HC_2O_4^-$

5.

What is the conjugate acid of water?

a)

$OH^-$

b)

$H_3O^+$

c)

$H_2O_2$

d)

$HOH$

6.

The value of Kw at 25 ^oC is always _____________

a)

1.0 x 10^-11

b)

1.0 x 10^-12

c)

1.0 x 10^-13

d)

1.0 x 10^-14

7.

What are the highest concentrations of Hydronium (H₃O⁺) and Hydroxide (OH^-) ions that can coexist in a water solution

a)

1.0 x 10 ^-14 each

b)

1.0 x 10⁰ and 1.0 x 10^-14

c)

1.0 x 10^-7 each

8.

A strong base in a water solution

a)

is a weak electrolyte

b)

produces many H⁺ ions

c)

will not dissolve

d)

completely dissociates into ions.

9.

Which of the following substances has the highest concentration of hydrogen ions in solution?

a)

bleach (pH = 11-13)

b)

water (pH = 7)

c)

tomato juice (pH = 4-5)

d)

vinegar (pH = 3-4)

10.

What is the pH of a solution with a hydrogen ion concentration of 1.0 x 10^-8 M?

(HINT...pH = -log [H⁺] )

a)

-8

b)

6

c)

8

d)

14

11.

What is the pH of a 0.0001 M HCl solution

a)

1

b)

4

c)

7

d)

11

12.

What is the pOH of a 1 x 10^-8M solution of HNO₃?

a)

8

b)

6

c)

7

d)

7.5

conjugate acids and bases, pH and pOH

Total questions: 12

Worksheet time: 12mins

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