- The mass of a flask containing excess calcium carbonate, CaCO₃(s), reacting with 100 cm³ of 0.50 mol dm⁻³ hydrochloric acid, HCl(aq), was monitored with time at 25 °C.
Diagram of a flask on a balance with cotton wool, containing dilute HCl and calcium carbonate
/* Curve I was obtained under these conditions. */
Which curve corresponds to the experiment when it was repeated at the same temperature using the same mass of same‑sized pieces of calcium carbonate and 50 cm³ of 0.50 mol dm⁻³ hydrochloric acid?
Graph of balance reading (g) vs time showing curves I, A, B, C, D