Certified Advanced Placement Teacher (AP)

Question 1

A 0.150 M solution of methylamine (CH₃NH₂) is prepared at 25°C. Given that Kb = 4.4 × 10⁻⁴ for methylamine, what is the pH of this solution?

11.90 2.10 11.18 12.66

Correct Answer:

11.90

Question 2

Which of the following species is amphiprotic?

SO₄²⁻ NH₄⁺ HCO₃⁻ CO₃²⁻

Correct Answer:

HCO₃⁻

Question 3

A 0.050 M solution of a weak acid HA has a measured pH of 3.17 at 25°C. What is the percent dissociation of HA?

1.35% 6.34% 0.68% 3.17%

Correct Answer:

1.35%

Question 4

For carbonic acid, Ka1 = 4.3 × 10⁻⁷ and Ka2 = 4.7 × 10⁻¹¹. Which statement best explains why Ka1 is approximately 10,000 times larger than Ka2?

H₂CO₃ has more hydrogen atoms available for donation than HCO₃⁻ The second proton must be removed from HCO₃⁻, which is already negatively charged, requiring greater energy to overcome the electrostatic attraction CO₃²⁻ is a stronger base than HCO₃⁻, shifting equilibrium left The O–H bond in HCO₃⁻ is longer and therefore weaker than in H₂CO₃

Correct Answer:

The second proton must be removed from HCO₃⁻, which is already negatively charged, requiring greater energy to overcome the electrostatic attraction

Question 5

A buffer solution has maximum resistance to pH change (maximum buffer capacity) when which condition is met?

The ratio [A⁻]/[HA] = 10 The concentration of the weak acid greatly exceeds the conjugate base concentration The molar concentrations of weak acid and conjugate base are equal The solution pH equals twice the pKa of the weak acid

Correct Answer:

The molar concentrations of weak acid and conjugate base are equal

Question 1

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Prepare with the Certified Advanced Placement Teacher (AP) practice quiz. This question bank includes 120 questions covering reaction, solution, cell, electron, and body. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Certified Advanced Placement Teacher (AP)

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