A student adds 0.3 g of magnesium metal to equal volumes of hydrochloric acid and ethanoic acid of the same concentrations in separate flasks. Which statement is correct?

A.     Hydrochloric acid reacts more rapidly as it has a higher pH than ethanoic acid.

B.     A greater total volume of \({{\text{H}}_{\text{2}}}\) gas is produced with hydrochloric acid than with ethanoic acid.

C.     The same total volume of \({{\text{H}}_{\text{2}}}\) gas is produced with both hydrochloric acid and ethanoic acid.

D.     Ethanoic acid reacts more slowly because it has a lower pH than hydrochloric acid.

C

Opinion was fairly evenly divided between answers B and C (correct).