DP Chemistry (last assessment 2024)
Question 18M.2.sl.TZ1.2e
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.2.sl.TZ1.2e |
| Level | sl | Paper | 2 | Time zone | TZ1 |
| Command term | Estimate | Question number | e | Adapted from | N/A |
e.
[Maximum mark: 1]
18M.2.sl.TZ1.2e
Calcium carbide, CaC2, is an ionic solid.
(e)
Calcium carbide reacts with water to form ethyne and calcium hydroxide.
CaC2(s) + H2O(l) → C2H2(g) + Ca(OH)2(aq)
Estimate the pH of the resultant solution.
[1]
Markscheme
pH > 7
Accept any specific pH value or range of values above 7 and below 14.
[1 mark]
