Question 1

Which of the following best describes a Brønsted-Lowry acid?

Accepted Answer

A substance that donates a proton (H$$^+) to $$another molecule or ion

Question 2

Which of the following is the correct conjugate base of HSO$$_4^-$$?

Accepted Answer

$$\mathrm{SO_4$^{2-}}$$

Question 3

A solution has $$[H_3O^+] = 2.0 	imes 10$$^{-5}$$ M. What is its pH?

Accepted Answer

$$4.70$$

Question 4

Which of the following acids is triprotic?

Accepted Answer

$$\mathrm{H_3PO_4}$$

Question 5

Which of the following statements about strong acids is correct?

Accepted Answer

Strong acids have weak conjugate bases

Question 6

What is the pH of a 0.020 M solution of HNO$$_3 (a $$strong acid)?

Accepted Answer

$$1.70$$

Question 7

Which of the following best describes the behavior of water in acid-base reactions?

Accepted Answer

Water is amphoteric, acting as either an acid or a base

Question 8

A buffer solution is prepared using acetic acid ($$K_a = 1.8 	imes 10$$^{-5}$$) and sodium acetate. If the concentrations of acetic acid and acetate ion are equal, what is the pH of the buffer?

Accepted Answer

$$4.74$$

Question 9

Which salt will produce a basic solution when dissolved in water?

Accepted Answer

NaCN

Question 10

A 0.100 M solution of HF ($$K_a = 3.5 	imes 10$$^{-4}$$) and 0.120 M NaF is prepared. What is the pH of this buffer? (pK_a = 3.46$)

Accepted Answer

$$3.54$$

Question 11

Which of the following equations correctly represents the neutralization reaction between HCl and NaOH?

Accepted Answer

$$\mathrm{HCl} + \mathrm{NaOH} \rightarrow \mathrm{NaCl} + \mathrm{H_2O}$$

Question 12

If the pH of a solution is 9, what is the $$[OH^-]$$ concentration?

Accepted Answer

$$1 	imes 10$$^{-5}$$ M

Question 13

Which of the following is true about the relationship between acid and conjugate base strength?

Accepted Answer

The stronger the acid, the weaker its conjugate base

Question 14

A 5.00 mL sample of vinegar is titrated with 44.5 mL of 0.100 M NaOH. What is the molarity of acetic acid in the vinegar? (Assume 1:1 stoichiometry)

Accepted Answer

$$0.890 M$$

Question 15

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 16

Which of the following is the correct expression for the acid dissociation constant ($$K_a) $$for a weak acid HA?

Accepted Answer

$$K_a = \frac{[H_3O^+][A^-]}{[HA]}$$

Question 17

A solution has $$[OH^-] = 1 	imes 10$$^{-3}$$ M. What is the pH?

Accepted Answer

$$11.00$$

Question 18

Which of the following is a real-life application of acid-base neutralization?

Accepted Answer

Using antacids to relieve heartburn

Question 19

Which of the following is the correct Henderson-Hasselbalch equation for a buffer solution?

Accepted Answer

$$\mathrm{pH} = \mathrm{p}K_a + \log \left( \frac{[A^-]}{[HA]} \right)$$

Chapter 10: Acids and Bases – GOB Chemistry Study Notes

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