DP Chemistry (last assessment 2024)
Question 19N.2.hl.TZ0.4a(i)
| Date | November 2019 | Marks available | [Maximum mark: 1] | Reference code | 19N.2.hl.TZ0.4a(i) |
| Level | hl | Paper | 2 | Time zone | TZ0 |
| Command term | Apply, Identify | Question number | a(i) | Adapted from | N/A |
a(i).
[Maximum mark: 1]
19N.2.hl.TZ0.4a(i)
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(i))
Identify a conjugate acid–base pair in the equation.
[1]
Markscheme
C6H8O7 AND C6H7O7−
OR
H2O AND H3O+ ✔
