Question 1

Which of the following statements about the Arrhenius theory of acids and bases is correct?

Accepted Answer

It defines acids as compounds that produce $$\mathrm{H^+}$$ ions in water.

Question 2

A student adds $$\mathrm{HCl} to $$pure water. According to the Brønsted-Lowry theory, what role does $$\mathrm{HCl}$$ play in this reaction?

Accepted Answer

Acid, because it donates a proton to water.

Question 3

Which of the following compounds is NOT a base?

Accepted Answer

$$\mathrm{$$HNO_3$$}$$

Question 4

A solution has a pH of 3. What is the hydronium ion concentration $$[\mathrm{H_3O^+}] in $$this solution?

Accepted Answer

$$10^{-3}$$\ \mathrm{mol/L}$$

Question 5

Which of the following is the correct balanced equation for the neutralization of barium hydroxide with hydrochloric acid?

Accepted Answer

$$\mathrm{Ba(OH)_2 + 2\ HCl \rightarrow $$BaCl_2$$ + 2\ H_2O}$$

Question 6

A buffer solution is prepared by mixing acetic acid and sodium acetate. Which statement best describes the function of this buffer?

Accepted Answer

It resists changes in pH when small amounts of strong acid or base are added.

Question 7

Which of the following pairs forms a conjugate acid-base pair?

Accepted Answer

$$\mathrm{H_2SO_4}$$ and $$\mathrm{$$HSO_4$$^-}$$

Question 8

A sample of rainwater has a pH of 3.5. Which ion is present in relatively large concentration in this sample?

Accepted Answer

$$\mathrm{H_3O^+}$$

Question 9

Which of the following is the correct formula for calcium hydroxide?

Accepted Answer

$$\mathrm{Ca(OH)_2}$$

Question 10

A solution with a pH of 12 is best described as:

Accepted Answer

Strongly basic

Question 11

If the concentration of a dilute solution of nitric acid is $$0.0001\ \mathrm{M}$$, what is the pH of the solution?

Accepted Answer

4

Question 12

Which of the following is NOT a characteristic of bases?

Accepted Answer

Turn litmus red

Question 13

The compound $$\mathrm{CH_3NH_2}$$ reacts with water to form $$\mathrm{CH_3NH_3^+}$$ and $$\mathrm{OH^-}. In $$this reaction, $$\mathrm{CH_3NH_2} is $$acting as a(n):

Accepted Answer

Base

Question 14

Which of the following statements about strong acids is correct?

Accepted Answer

A strong acid ionizes completely in water.

Question 15

Phosphoric acid is commonly added to soft drinks for tartness. What is its chemical formula?

Accepted Answer

$$\mathrm{H_3PO_4}$$

Question 16

In the balanced chemical reaction for the neutralization of calcium hydroxide with nitric acid ($$\mathrm{$$HNO_3$$}$$), what is the coefficient of nitric acid?

Accepted Answer

2

Question 17

Which of the following statements about buffers is FALSE?

Accepted Answer

A buffer is made up of a strong acid and its conjugate base.

Question 18

Which ion is known as the hydronium ion?

Accepted Answer

$$\mathrm{H_3O^+}$$

Question 19

A hospital patient is given a buffer solution intravenously to maintain blood pH. Why is this important?

Accepted Answer

Buffers help maintain a stable pH, which is critical for enzyme function and metabolic processes.

Question 20

A student mixes $$0.1\ \mathrm{M}$$ acetic acid with $$0.1\ \mathrm{M}$$ sodium acetate. What will happen if a small amount of $$\mathrm{HCl} is $$added?

Accepted Answer

The pH will decrease only slightly due to the buffer action.

Acids, Bases, and pH: Key Concepts and Practice Questions

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