Q: What is the $$[OH^-] in a $$solution with $$[H_3O^+] = 1.0 \times 10$$^{-5}$$\ \mathrm{M} at 25$$°C?

$$1.0 \times 10$$^{-9}$$\ \mathrm{M}$$

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 not dissolved by most acids, making it a safe container for acids.

Question 2

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

Accepted Answer

They feel slippery due to soaplike substances formed with skin oils.

Question 3

Which of the following equations correctly represents the neutralization reaction between hydrochloric acid and sodium hydroxide?

Accepted Answer

$$\mathrm{HCl(aq) + NaOH(aq) \rightarrow NaCl(aq) + H_2O(l)}$$

Question 4

A solution has $$[H_3O^+] = 1.0 	imes 10$$^{-4}$$\ \mathrm{M}. $$What is its pH?

Accepted Answer

$$4.0$$

Question 5

Which of the following best describes a buffer solution?

Accepted Answer

A solution that resists changes in pH when small amounts of acid or base are added.

Question 6

Which of the following is the correct balanced equation for the reaction of magnesium metal with hydrochloric acid?

Accepted Answer

$$\mathrm{Mg(s) + 2HCl(aq) \rightarrow $$MgCl_2$$(aq) + H_2$(g)}$$

Question 7

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

Accepted Answer

Strong acids ionize completely in water, while weak acids ionize only partially.

Question 8

A student titrates 25.0 mL of HCl with 0.200 M NaOH. It takes 30.0 mL of NaOH to reach the equivalence point. What is the concentration of the HCl solution?

Accepted Answer

$$0.150\ \mathrm{M}$$

Question 9

Which of the following is an Arrhenius base?

Accepted Answer

$$\mathrm{NaOH}$$

Question 10

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

Accepted Answer

A base is a substance that accepts a proton.

Question 11

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

Accepted Answer

$$\mathrm{NH_3$}$$ / $$\mathrm{NH_4$^+}$$

Question 12

Which of the following best explains why sodium bicarbonate (baking soda) can relieve heartburn?

Accepted Answer

It is a weak base that neutralizes excess stomach acid.

Question 13

What is the $$[OH^-] in a $$solution with $$[H_3O^+] = 1.0 	imes 10$$^{-5}$$\ \mathrm{M} at 25$$°C?

Accepted Answer

$$1.0 	imes 10$$^{-9}$$\ \mathrm{M}$$

Question 14

Which of the following is a real-world example of a buffer system?

Accepted Answer

Human blood maintaining a pH near 7.4

Question 15

Which of the following statements about the pH scale is correct?

Accepted Answer

A decrease of 1 unit on the pH scale corresponds to a tenfold increase in $$[H_3O^+].$$

Question 16

Which of the following best describes why strong acids are strong electrolytes?

Accepted Answer

They completely ionize in solution, producing many ions.

Question 17

A solution has a pH of 8.37. What is the $$[H_3O^+]$$?

Accepted Answer

$$4.3 	imes 10$$^{-9}$$\ \mathrm{M}$$

Question 18

Which of the following is a property of carboxylic acids?

Accepted Answer

They contain the $$-COOH$$ group.

Question 19

Which of the following best describes the role of an indicator in an acid–base titration?

Accepted Answer

It signals the equivalence point by changing color.

Acids and Bases: Foundations, Properties, and Calculations

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