Q: Which of the following is the correct formula for the ion product constant for water ($$K_w) at$$ $$25^\circ\mathrm{C}$$?

$$K_w = [\mathrm{H}_3\mathrm{O}^+][\mathrm{OH}^-] = 1.0 \times 10$$^{-14}$$

Question 1

Which of the following statements best explains why gold is used for James Bond’s acid-filled pen in spy movies?

Accepted Answer

Gold is one of the few metals that is not dissolved by most acids.

Question 2

Which property is NOT characteristic of acids?

Accepted Answer

They feel slippery to the touch.

Question 3

Which of the following is a correct balanced equation for the reaction between hydrochloric acid and sodium bicarbonate?

Accepted Answer

$$\mathrm{HCl}(aq) + \mathrm{NaHCO}_3(aq) \rightarrow \mathrm{H}_2O(l) + \mathrm{CO}_2(g) + \mathrm{NaCl}(aq)$$

Question 4

Which of the following is a Brønsted–Lowry base but NOT an Arrhenius base?

Accepted Answer

$$\mathrm{NH}_3$$

Question 5

A solution has $$[\mathrm{H}_3\mathrm{O}^+] = 2.0 	imes 10$$^{-5}$$\ \mathrm{M}. $$What is the pH of this solution?

Accepted Answer

$$4.70$$

Question 6

Which of the following best describes a buffer solution?

Accepted Answer

A solution containing a weak acid and its conjugate base.

Question 7

Which of the following acids is diprotic and strong in its first ionization but weak in its second?

Accepted Answer

Sulfuric acid ($$\mathrm{H}_2\mathrm{SO}_4)$$

Question 8

A titration requires $$25.00\ \mathrm{mL} of$$ $$0.200\ \mathrm{M}\ \mathrm{NaOH} to $$neutralize $$50.00\ \mathrm{mL} of an $$unknown monoprotic acid. What is the concentration of the acid?

Accepted Answer

$$0.100\ \mathrm{M}$$

Question 9

Which of the following is the correct net ionic equation for the neutralization of a strong acid with a strong base?

Accepted Answer

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

Question 10

Which of the following statements about strong and weak acids is TRUE?

Accepted Answer

A strong acid completely ionizes in solution, while a weak acid only partially ionizes.

Question 11

Which of the following is a correct calculation for the hydroxide ion concentration in a $$0.025\ \mathrm{M}\ \mathrm{Sr(OH)_2}$$ solution?

Accepted Answer

$$[\mathrm{OH}^-] = 0.050\ \mathrm{M}$$

Question 12

A solution has $$[\mathrm{OH}^-] = 1.0 	imes 10$$^{-9}$$\ \mathrm{M}. $$What is the pH of the solution at $$25^\circ\mathrm{C}$$?

Accepted Answer

$$5.00$$

Question 13

Which of the following best describes the role of buffers in the human body?

Accepted Answer

Buffers keep the blood pH within a narrow range, preventing harmful changes.

Question 14

Which of the following is the correct formula for the ion product constant for water ($$K_w) at$$ $$25^\circ\mathrm{C}$$?

Accepted Answer

$$K_w = [\mathrm{H}_3\mathrm{O}^+][\mathrm{OH}^-] = 1.0 	imes 10$$^{-14}$$

Question 15

Which of the following is a correct statement about the taste and safety of acids and bases in foods?

Accepted Answer

Acids are responsible for the sour taste in foods like lemons, while bases are less common in foods due to their bitter taste and potential toxicity.

Question 16

Which of the following is the correct relationship between pH and $$[\mathrm{H}_3\mathrm{O}^+]$$?

Accepted Answer

$$\mathrm{pH} = -\log [\mathrm{H}_3\mathrm{O}^+]$$

Question 17

Which of the following is a real-world consequence of ethylene glycol poisoning (from antifreeze) in animals?

Accepted Answer

The glycolic acid produced overwhelms the blood’s buffer system, causing a dangerous drop in blood pH.

Question 18

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

Accepted Answer

$$\mathrm{NH}_3 ($$base) and $$\mathrm{NH}_4^+ ($$conjugate acid)

Chapter 14: Acids and Bases – Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard