8.4 Strong and weak acids and bases

Aqueous solutions of a weak acid and a strong acid of equal concentration are compared. Which statements are correct?

I. The weak acid is less dissociated than the strong acid.

II. The strong acid reacts with a metal oxide but the weak acid does not.

III. The strong acid has greater conductivity than the weak acid.

• I and II only

• I and III only

• II and III only

• I, II and III

Which of these acids has the weakest conjugate base?

• HCl

• CH3COOH

• NH4Cl

• C6H5COOH

Which compound is a strong acid?

• NH₃

• HNO₃

• H₂CO₃

• CH₃COOH

Which 1.0 mol dm–3 solution has the highest pH?

• A. Ammonium chloride

• B. Sulfuric acid

• C. Sodium chloride

• D. Ammonia

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

What are the weak acids and bases?

• all acids and bases are weak
• if not classified as strong, the acid/base is considered weak
• all acids and bases are strong
• there are more strong acids and bases than there are weak acids/bases

Strong acids and bases...

• do not break apart into ions (non-electrolyte)
• partially break apart into ions (weak electrolyte)
• completely break apart into ions (non-electrolyte)
• completely break apart into ions (strong electrolyte)

Which of the following acids will conduct electricity the best?

• Ethanoic acid

• Nitric acid

• Carbonic acid

• Citric acid