DP Chemistry (last assessment 2024)
Question 19N.3.sl.TZ0.b
| Date | November 2019 | Marks available | [Maximum mark: 2] | Reference code | 19N.3.sl.TZ0.b |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Outline | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
19N.3.sl.TZ0.b
The structure of aspirin is shown in section 37 of the data booklet.
Aspirin, C6H4(OCOCH3)COOH, is only slightly soluble in water.
Outline, including an equation, how aspirin can be made more water-soluble. Use section 37 in the data booklet.
[2]
Markscheme
react with sodium hydroxide/NaOH/«strong» base
OR
convert to «ionic» salt ✔
NOTE: Accept other suitable bases (eg, KOH/NaHCO3/Na2CO3) with corresponding equation for chosen base for M2.
Accept “CaCO3”, although calcium salicylate is not water soluble.
Accept ionic equation.
C6H4(OCOCH3)COOH (s) + NaOH (aq) → C6H4(OCOCH3)COONa (aq) + H2O (l) ✔
NOTE: Award [2] for M2.
