Question 1

Which of the following statements best explains why HI is a stronger acid than HF?

Accepted Answer

HI has a weaker H–I bond, making it easier to lose H⁺.

Question 2

Which of the following is NOT a strong acid according to the study materials?

Accepted Answer

CH₃COOH

Question 3

A solution contains 0.10 M HCl and 0.10 M CH₃COOH. Which solution has a higher percent ionization and why?

Accepted Answer

HCl, because it is a strong acid and ionizes completely.

Question 4

Which of the following functional groups is most likely to make a drug molecule basic?

Accepted Answer

–NH₂ (amine)

Question 5

What is the conjugate base of HSO₄⁻?

Accepted Answer

SO₄²⁻

Question 6

Which of the following acids is the strongest based on the number and type of halogen substituents?

Accepted Answer

CF₃COOH

Question 7

Given the following reaction: $$\mathrm{NH_3$(aq) + H_2O(l) \rightleftharpoons NH_4$^+(aq) + OH^-(aq)}$$, identify the Brønsted-Lowry acid and base on the reactant side.

Accepted Answer

NH₃ is the base, H₂O is the acid.

Question 8

Which of the following best describes an amphoteric substance?

Accepted Answer

A substance that can act as both an acid and a base.

Question 9

Calculate the percent ionization of a 0.10 M HF solution given $$K_a = 6.8 	imes 10$$^{-4}$$. Use the approximation x^2$/(0.10) = 6.8 	imes 10$$^{-4}$$.

Accepted Answer

8.25%

Question 10

Which of the following statements about strong acids is correct?

Accepted Answer

Strong acids have weak conjugate bases.

Question 11

Which of the following best explains why HClO₄ is a stronger acid than HClO?

Accepted Answer

HClO₄ has more oxygen atoms, which increases electron withdrawal and stabilizes the conjugate base.

Question 12

Which of the following is the correct $$K_a$$ expression for the dissociation of acetic acid ($$\mathrm{CH_3COOH}) in $$water?

Accepted Answer

$$K_a = \frac{[\mathrm{H_3O^+}][\mathrm{CH_3COO^-}]}{[\mathrm{CH_3COOH}]}$$

Question 13

Which of the following solutions will have the largest amount of undissociated acid molecules remaining at equilibrium?

Accepted Answer

0.10 M CH₃COOH

Question 14

Which of the following best describes the effect of dilution on the percent ionization of a weak acid?

Accepted Answer

Percent ionization increases as the solution is diluted.

Question 15

Which of the following is a correct statement about the relationship between bond energy and acid strength for binary acids?

Accepted Answer

Lower bond energy corresponds to a stronger acid.

Question 16

Which of the following is the conjugate acid of $$\mathrm{$$HPO_4$$^{2-}}$$?

Accepted Answer

$$\mathrm{H_2PO_4^-}$$

Question 17

A bottle labeled '2N H₂SO₄' is found in a laboratory. Which statement is true about this solution?

Accepted Answer

It contains a strong acid that is nearly 100% ionized in water.

Question 18

Which of the following best explains why carboxylic acids with electronegative substituents are stronger acids?

Accepted Answer

Electronegative substituents stabilize the conjugate base by withdrawing electron density.

Question 19

Which of the following is a real-life example of a weak acid found in food?

Accepted Answer

Citric acid in orange juice

Acids and Bases: Strength, Structure, and Applications

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