DP Chemistry (last assessment 2024)
Question 19N.2.hl.TZ0.4a(iii)
| Date | November 2019 | Marks available | [Maximum mark: 2] | Reference code | 19N.2.hl.TZ0.4a(iii) |
| Level | hl | Paper | 2 | Time zone | TZ0 |
| Command term | State | Question number | a(iii) | Adapted from | N/A |
a(iii).
[Maximum mark: 2]
19N.2.hl.TZ0.4a(iii)
A molecule of citric acid, C6H8O7, is shown.
The equation for the first dissociation of citric acid in water is
C6H8O7 (aq) + H2O (l) C6H7O7− (aq) + H3O+ (aq)
(a(iii))
The dissociation of citric acid is an endothermic process. State the effect on the hydrogen ion concentration, [H+], and on Ka, of increasing the temperature.
[2]
Markscheme
