DP Chemistry (last assessment 2024)
Question 18M.2.sl.TZ2.1d
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.2.sl.TZ2.1d |
| Level | sl | Paper | 2 | Time zone | TZ2 |
| Command term | Calculate | Question number | d | Adapted from | N/A |
d.
[Maximum mark: 1]
18M.2.sl.TZ2.1d
A student determined the percentage of the active ingredient magnesium hydroxide, Mg(OH)2, in a 1.24 g antacid tablet.
The antacid tablet was added to 50.00 cm3 of 0.100 mol dm−3 sulfuric acid, which was in excess.
(d)
Calculate the amount of H2SO4 that reacted with Mg(OH)2.
[1]
Markscheme
n(H2SO4) reacted «= 0.00500 – 0.001178» = 0.00382/3.82 × 10–3 «mol»
[1 mark]
