DP Chemistry (last assessment 2024)
Question 22M.2.sl.TZ1.2e(i)
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.2.sl.TZ1.2e(i) |
| Level | sl | Paper | 2 | Time zone | TZ1 |
| Command term | State | Question number | e(i) | Adapted from | N/A |
e(i).
[Maximum mark: 1]
22M.2.sl.TZ1.2e(i)
Ammonia, NH3, is industrially important for the manufacture of fertilizers, explosives and plastics.
Ammonia is soluble in water and forms an alkaline solution:
NH3 (g) + H2O (l) NH4+ (aq) + HO– (aq)
(e(i))
State the relationship between NH4+ and NH3 in terms of the Brønsted–Lowry theory.
[1]
Markscheme
conjugate «acid and base» ✔
Examiners report
About half the candidates recognised the species as a conjugate acid-base pair, though some lost the mark by confusing the acid and base, even though this information was not asked for.
