Q: If the $$[\mathrm{OH}^-] in a $$solution is $$1.0 \times 10$$^{-10}$$\ \mathrm{M} at 25$$°C, what is the $$[\mathrm{H}_3\mathrm{O}^+]$$?

$$1.0 \times 10$$^{-4}$$\ \mathrm{M}$$

Question 1

Which of the following statements best explains why hydrochloric acid (HCl) is classified as a strong acid in water?

Accepted Answer

HCl completely dissociates into ions in aqueous solution.

Question 2

Which of the following is the correct name for HNO₂ when dissolved in water?

Accepted Answer

Nitrous acid

Question 3

A solution has a hydronium ion concentration of $$2.0 	imes 10$$^{-4}$$\ \mathrm{M}. $$What is the pH of this solution?

Accepted Answer

$$2.70$$

Question 4

Which of the following is an example of an amphoteric substance?

Accepted Answer

$$HCO_3^-$$

Question 5

What is the net ionic equation for the neutralization reaction between hydrochloric acid and sodium hydroxide?

Accepted Answer

$$\mathrm{H}^+(aq) + \mathrm{OH}^-(aq) \rightarrow \mathrm{H}_2\mathrm{O}(l)$$

Question 6

Which of the following best describes the Brønsted-Lowry definition of a base?

Accepted Answer

A base is a substance that accepts a hydrogen ion (H⁺).

Question 7

Which of the following pairs are conjugate acid-base pairs?

Accepted Answer

$$\mathrm{NH}_3$$ and $$\mathrm{NH}_4^+$$

Question 8

A student mixes acetic acid ($$\mathrm{CH}_3\mathrm{COOH}) $$with sodium bicarbonate ($$\mathrm{NaHCO}_3). $$Which products are expected from this reaction?

Accepted Answer

$$\mathrm{CO}_2$$, \mathrm{NaCH}_3\mathrm{COO}$$, and $$\mathrm{H}_2\mathrm{O}$

Question 9

Which of the following statements is true regarding the direction of an acid-base reaction?

Accepted Answer

The reaction favors the direction that goes from stronger to weaker chemical species.

Question 10

What is the conjugate base of $$\mathrm{HCO}_3^-$$?

Accepted Answer

$$\mathrm{CO}_3$$^{2-}$$

Question 11

Which of the following is a property of bases but not acids?

Accepted Answer

They have a soapy (slippery) feel.

Question 12

A solution has a pH of 9.2. Which of the following best describes this solution?

Accepted Answer

It is basic because pH \u003e 7.

Question 13

Which of the following is the correct $$K_a$$ expression for the dissociation of formic acid ($$\mathrm{HCOOH}) in $$water?

Accepted Answer

$$K_a = \dfrac{[\mathrm{H}_3\mathrm{O}^+][\mathrm{HCOO}^-]}{[\mathrm{HCOOH}]}$$

Question 14

Which of the following is a strong base?

Accepted Answer

KOH

Question 15

If the $$[\mathrm{OH}^-] in a $$solution is $$1.0 	imes 10$$^{-10}$$\ \mathrm{M} at 25$$°C, what is the $$[\mathrm{H}_3\mathrm{O}^+]$$?

Accepted Answer

$$1.0 	imes 10$$^{-4}$$\ \mathrm{M}$$

Question 16

Which of the following best describes why antacids are effective in treating heartburn?

Accepted Answer

They neutralize excess stomach acid by reacting with HCl.

Question 17

Which of the following is the correct formula for the water dissociation constant ($$K_w) at 25$$°C?

Accepted Answer

$$K_w = [\mathrm{H}_3\mathrm{O}^+][\mathrm{OH}^-]$$

Question 18

Which of the following is the correct name for $$\mathrm{H}_3\mathrm{PO}_4$$?

Accepted Answer

Phosphoric acid

Question 19

A solution has a pH of 3.0. Which of the following statements is true?

Accepted Answer

The solution is acidic because pH \u003c 7.

Chapter 11: Acids and Bases (Sections 11.1–11.7) – Study Notes

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