Q: Which of the following is the correct $$K_a$$ value for a weak acid if $$[H^+] = 1.0 \times 10$$^{-4}$$ M, $$[A^-] = 1.0 \times $$10^{-4} M$$, and $$[HA] = 0.10 M$$?

$$K_a = \frac{(1.0 \times 10$$^{-4}$$)(1.0 \times 10$$^{-4}$$)}{0.10}$$

Question 1

Which of the following is a correct statement about carboxylic acids, as described in the study materials?

Accepted Answer

The acidic hydrogen atom in carboxylic acids is bonded to an oxygen atom.

Question 2

Which of the following is NOT a strong acid according to the provided list?

Accepted Answer

HC2H3O2

Question 3

According to Arrhenius’ definition, what is the effect of adding an acid to water?

Accepted Answer

It raises the concentration of H+ ions.

Question 4

Which equation correctly represents the dissociation of a strong acid in water?

Accepted Answer

$$HA \rightarrow H^+ + A^-$$

Question 5

Which of the following acids is expected to be a weak electrolyte?

Accepted Answer

CH3COOH

Question 6

Given the equilibrium $$HA \rightleftharpoons H^+ + A^-$$, which expression correctly defines the acid dissociation constant $$K_a$$?

Accepted Answer

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

Question 7

Which statement best describes the relationship between $$pK_a$$ and acid strength?

Accepted Answer

A smaller $$pK_a$$ value indicates a stronger acid.

Question 8

Which of the following is a correct formula for acetic acid?

Accepted Answer

CH3COOH

Question 9

Which of the following bases is commonly found in household cleaning products?

Accepted Answer

NaOH

Question 10

A solution contains 0.10 M CH3COOH. Which of the following statements is true about its ionization?

Accepted Answer

It will partially ionize in water.

Question 11

Which of the following is the correct $$K_a$$ value for a weak acid if $$[H^+] = 1.0 	imes 10$$^{-4}$$ M, $$[A^-] = 1.0 	imes $$10^{-4} M$$, and $$[HA] = 0.10 M$$?

Accepted Answer

$$K_a = \frac{(1.0 	imes 10$$^{-4}$$)(1.0 	imes 10$$^{-4}$$)}{0.10}$$

Question 12

Which of the following is a correct statement about strong acids?

Accepted Answer

Strong acids dissociate irreversibly in water.

Question 13

Which of the following is a correct formula for sulfuric acid?

Accepted Answer

H2SO4

Question 14

Which of the following is a correct formula for the conjugate base of acetic acid?

Accepted Answer

CH3COO-

Question 15

Which of the following statements is true regarding the $$K_a$$ values of weak acids?

Accepted Answer

Weak acids have $$K_a$$ values much less than 1.

Question 16

Which of the following is a correct formula for nitric acid?

Accepted Answer

HNO3

Question 17

Which of the following is a correct formula for a common inorganic base?

Accepted Answer

NaOH

Question 18

Which of the following is a correct formula for citric acid?

Accepted Answer

H3C6H5O7

Question 19

Which of the following is a correct formula for phosphoric acid?

Accepted Answer

H3PO4

Acid-Base Equilibria: Definitions, Strength, and Quantification

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