CSEC Chemistry · May/June 2013 · Paper 2 · Question 4(b)(iii)

An experiment was carried out where an unknown mass of calcium carbonate chips was added to excess 2 mol dm⁻³ hydrochloric acid. The volume of CO₂ evolved was measured at specific times using a gas syringe. The results were plotted and produced the graph shown in Figure 4. The reaction equation is: CaCO₃ (s) + 2HCl (aq) → CaCl₂ (aq) + CO₂ (g) + H₂O (l).

One of the students suggested that powdered calcium carbonate should have been used instead of chips. State, with reason, how the time for completion of the experiment would have been affected.

This question uses a figure or table from the paper — you'll see it when you practise.