Free Printable ACID-BASE EQUILIBRIUM PART 1

1.

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

a)

HCl/OCl^-

b)

H₂SO₄/SO₄^2-

c)

NH₄⁺/NH₃

d)

H₃O⁺/OH^-

2.

Which of the following is not a strong acid?

a)

nitric

b)

sulfuric

c)

perchloric

d)

hydrofluoric

3.

Which of the following is the conjugate acid of HCO₃^-1?

a)

H₂CO₃

b)

CO₃^-2

c)

H₂CO_3^-1

d)

CO₃^-1

4.

The pH at the equivalence point of the titration of a strong acid with a strong base is:

a)

3.9

b)

4.5

c)

7.0

d)

8.2

5.

The pH of a solution at 25^ₒC in which [OH-] = 3.9 x 10^-5M is:

a)

4.41

b)

3.90

c)

9.59

d)

4.80

6.

What is $K_{w\ }$ ?

a)

Is the dissociation constant of weak acid reaction.

b)

Is the dissociation constant of weak base reaction.

c)

Is the dissociation constant of the Auto Ionization of water.

d)

Is the dissociation constant of any equilibrium reaction.

7.

Calculate the [H⁺] in a solution that has a pH of 2.73.

a)

5.4 x 10^-12 M

b)

1.9 x 10^-3 M

c)

2.7 M

d)

11.3 M

8.

dissociation of weak acid, HA, is represented by following equation :

HA(aq) + H₂O(l) ⇌ H₃O⁺(aq) + A^-(aq)

The equilibrium constant for this reaction is represented by K_a . Which of the following equation represents expression of equilibrium constant, K_a?

a)

b)

c)

d)

9.

What is the pOH of a solution where the [OH-] is 7.3 x 10-2 M?

a)

-1.14

b)

2.0

c)

1.14

d)

7.3

10.

Identify the Bronsted Lowry Acid (A) and Base (B) in the given reaction.

a)

A

b)

B

c)

C

d)

D

11.

Which is the weakest acid?

a)

HF

b)

HNO₂

c)

CH₃COOH

d)

HClO

12.

Calculate the pH of a 0.47M NH₃ (K_b = 1.8 x 10^-5) solution.

a)

2.54

b)

8.93

c)

5.07

d)

11.46

13.

The following statement is true for arrhenius acid and base EXCEPT

a)

Arrhenius acid produces H⁺ ions

b)

Arrhenius base produces OH^- ions

c)

H₂O need to be present for Arrhenius acid base to dissociate

d)

Hydrogen atoms make the solution acidic

14.

a)

A

b)

B

c)

C

15.

a)

A

b)

B

c)

C

d)

D

16.

a)

A

b)

B

c)

C

17.

a)

A

b)

B

c)

C

d)

D

e)

E

18.

a)

A

b)

B

c)

C

d)

D

e)

E

19.

For this reaction :

B(aq) + H₂O(l) ⇌ BH⁺(aq) + OH^-(aq)

Which one can act as an acid ?

a)

B(aq) and BH⁺(aq)

b)

B(aq) and BH⁺(aq)

c)

H₂O(l) and BH⁺(aq)

d)

H₂O(l) and OH^-(aq)

20.

Chloroacetic acid (CH₂ClCOOH) has a K_a value of 1.40 x 10^-3. What is the K_b value?

a)

1.40 x 10^-3

b)

7.14 x 10^-12

c)

5.81 x 10^-8

d)

6.34 x 10^-9

21.

The K_a for HClO is 3.5 x 10^-8. If the acid has a concentration of 0.70 M. Determine the % dissociation.

a)

0.13 %

b)

0.084 %

c)

0.041 %

d)

0.022 %

22.

A substance that ionizes completely in solution is

a)

an insulator.

b)

a strong electrolyte.

c)

a weak acid.

d)

a non-electrolyte.

23.

Use the K_a values to determine whether there are more products or reactants at equilibrium for the given reaction.
K_a NH₄⁺¹= 5.6x10^-10K_a HCO₃^-1= 4.8x10^-11

a)

More products.
K_a NH₄⁺¹ > K_a HCO₃^-1

b)

More products.
K_a NH₄⁺¹< K_a HCO₃^-1

c)

More reactants.
K_a NH₄⁺¹> K_a HCO₃^-1

d)

More reactants.
K_a NH₄⁺¹< K_a HCO₃^-1

24.

The [OH^-] in a soft drink is
5.00 x 10^-12 M. Find the pH.

a)

0.002

b)

2.7

c)

11.3

d)

14

25.

which of the following statement is NOT correct?

a)

As $K_a$ value increases $pK_a$ value decreases the stronger the acid is.

b)

As $K_a$ value decreases $pK_a$ value decreases the weaker the acid is.

c)

As $pK_a$ value increases $K_a$ value decreases the weaker the acid is.

d)

The higher the $K_a$ the lower the $K_b$

26.

The relation between pH and pOH is

a)

pH x pOH = 14

b)

pH + pOH = 14

c)

pH x pOH = $10^{-14}$

d)

pH + pOH = $10^{-14}$

27.

Which of the following formula shows the relation between Hydronium and Hydroxide ions in any acidic or basic solution?

a)

$\left[H^+\right]+\left[OH^-\right]=10^{-14}$

b)

$\left[H^+\right]\ .\ \left[OH^-\right]=10^{-14}$

c)

$\frac{\left[H^+\right]}{\left[OH^-\right]}=10^{-14}$

d)

$-\log\left[H^+\right]\ .\ -\log\left[OH^-\right]=10^{-14}$

ACID-BASE EQUILIBRIUM PART 1

Total questions: 27

Worksheet time: 7hrs 45mins

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