DP Chemistry (last assessment 2024)
Question 18M.3.sl.TZ2.18a
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.3.sl.TZ2.18a |
| Level | sl | Paper | 3 | Time zone | TZ2 |
| Command term | Formulate | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 1]
18M.3.sl.TZ2.18a
Excess acid in the stomach is often treated with calcium carbonate.
(a)
Formulate a chemical equation for the neutralization of stomach acid with calcium carbonate.
[1]
Markscheme
2HCl(aq) + CaCO3(s) → H2O(l) + CO2(g) + CaCl2(aq)
Accept ionic equation:
2H+(aq) + CO32–(aq) → CO2(g) + H2O(l)
[1 mark]
