CAIE IGCSE Chemistry 7.1.10 Strong Acid As an Acid That Is Questions

Compare complete and partial acid ionisation, hydrogen-ion concentration, pH and reaction rates while separating acid strength from concentration.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • define strong acids as completely dissociated and weak acids as partially dissociated in water
  • compare pH and H+(aq) concentration for hydrochloric acid and ethanoic acid
  • use magnesium reaction rates and hydrogen volumes to infer stronger or weaker acid behaviour
  • distinguish acid strength from concentration in unfamiliar solutions

CAIE IGCSE Chemistry 7.1.10 Strong Acid As an Acid That Is Questions question 1

[Maximum number: 1]

Two acids, P and Q, with the same concentration and volume are reacted separately with the same mass of magnesium ribbon.

The reactions produce the same total volume of hydrogen gas but acid Q reacts much more slowly than acid P.

Which explanation for the difference between P and Q is correct?

A

Acid P has a higher pH than acid Q.

B

Acid P has a lower concentration of hydrogen ions.

C

Acid Q is partially dissociated and acid P is fully dissociated.

D

Acid Q is a proton acceptor.

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