Q: What is the ion product constant for water ($$K_w) at 25$$°C?

$$K_w = 1.0 \times 10$$^{-14}$$

Question 1

Which of the following statements best describes the Arrhenius definition of an acid?

Accepted Answer

An acid produces H$$^+$$ ions in aqueous solution.

Question 2

A student mixes hydrochloric acid (HCl) with sodium hydroxide (NaOH) in a titration experiment. What is the net ionic equation for the neutralization reaction?

Accepted Answer

$$\mathrm{H^+(aq) + OH^-(aq) \rightarrow H_2O(l)}$$

Question 3

Which property is NOT characteristic of acids?

Accepted Answer

Acids feel slippery.

Question 4

Which of the following acids is considered a strong acid?

Accepted Answer

Hydrochloric acid ($$\mathrm{HCl})$$

Question 5

A solution contains 0.025 M Sr(OH)$$_2. $$What is the concentration of OH$$^-$$ ions?

Accepted Answer

$$0.050\ \mathrm{M}$$

Question 6

Which of the following statements about buffers is correct?

Accepted Answer

Buffers contain significant amounts of a weak acid and its conjugate base.

Question 7

What is the pH of a solution with $$[\mathrm{H_3O^+}] = 1.0 	imes 10$$^{-7}$$\ \mathrm{M} at 25$$°C?

Accepted Answer

pH = 7

Question 8

Which of the following reactions is an example of a gas evolution reaction?

Accepted Answer

$$\mathrm{HCl(aq) + $$NaHCO_3$$(aq) \rightarrow H_2O(l) + CO_2$(g) + NaCl(aq)}$$

Question 9

Which of the following bases is considered a strong base?

Accepted Answer

Potassium hydroxide ($$\mathrm{KOH})$$

Question 10

A 10.00 mL sample of HCl solution requires 12.54 mL of 0.100 M NaOH to reach the equivalence point. What is the concentration of the HCl solution?

Accepted Answer

$$0.125\ \mathrm{M}$$

Question 11

Which of the following statements about the Brønsted–Lowry definition of acids and bases is correct?

Accepted Answer

An acid is a proton donor and a base is a proton acceptor.

Question 12

Which of the following is an amphoteric substance?

Accepted Answer

Water ($$\mathrm{H_2O})$$

Question 13

What is the ion product constant for water ($$K_w) at 25$$°C?

Accepted Answer

$$K_w = 1.0 	imes 10$$^{-14}$$

Question 14

Which of the following acids is a carboxylic acid?

Accepted Answer

Acetic acid ($$\mathrm{HC_2H_3O_2})$$

Question 15

Which of the following statements about strong acids is correct?

Accepted Answer

Strong acids completely ionize in solution.

Question 16

A solution has $$[\mathrm{H_3O^+}] = 7.5 	imes 10$$^{-5}$$\ \mathrm{M}. $$What is the $$[\mathrm{OH^-}] in $$the solution?

Accepted Answer

$$1.33 	imes 10$$^{-10}$$\ \mathrm{M}$$

Question 17

Which of the following is a real-world consequence of acid rain?

Accepted Answer

Acid rain dissolves metals and metal oxides in building materials.

Question 18

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

Accepted Answer

$$\mathrm{H_2O}$$ and $$\mathrm{OH^-}$$

Question 19

Which of the following statements about weak bases is correct?

Accepted Answer

Weak bases produce OH$$^- by $$accepting a proton from water.

Acids and Bases: Properties, Definitions, and Reactions

Guida di studio - Domande di pratica

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