Strong and Weak Acids

Which of the following is the correct definition for a strong acid?

• Partially dissociates into ions when dissolved in water and the change is not reversible

• Fully dissociates into ions when dissolved in water and the change is not reversible

• Fully dissociates into ions when dissolved in water and the change is reversible

• Partially dissociates into ions when dissolved in water and the change is reversible

Which of the following is a strong acid?

• Ethanoic acid (CH₃COOH)

• Nitric acid (HNO₃)

• Hydrofluoric acid (HF)

• Citric acid

Which of the following is the correct balanced equation showing the dissociation of sulfuric acid into ions?

• H₂SO₄ (aq) → H⁺ (aq) + SO₄^–(aq)

• H₂SO₄ (aq) ⇌ 2H⁺ (aq) + SO₄^2- (aq)

• HSO₄ (aq) → H⁺(aq) + SO₄^–(aq)

• H₂SO₄ (aq) → 2H⁺ (aq) + SO₄^2- (aq)

Which of the following statements is true?

• If the H⁺ ion concentration in a solution increases by a factor of 10, the pH of the solution increases by 1

• If the H⁺ ion concentration in a solution increases by a factor of 10, the pH of the solution decreases by 1

What ions do metals form when they react?

• anions

• cations

Select the strong acids.

• HF

• HCl

• H₂SO₄

• HNO₃

A weak acid always has a K_a value.

• True

• False

A strong acid sometimes has a K_a value.

• True

• False

Litmus paper can tell you if a solution is acidic, neutral or basic by changing color when placed in a solution.  If you test a base with litmus paper, it will turn ____________.

• purple
• red
• blue
• pink

Which of the following is an acid?

• CO₂
• KOH
• NH₃
• HBr