DP Chemistry (last assessment 2024)
Question 18M.2.sl.TZ2.f
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.2.sl.TZ2.f |
| Level | sl | Paper | 2 | Time zone | TZ2 |
| Command term | Calculate | Question number | f | Adapted from | N/A |
f.
[Maximum mark: 1]
18M.2.sl.TZ2.f
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.
Calculate the percentage by mass of magnesium hydroxide in the 1.24 g antacid tablet to three significant figures.
[1]
Markscheme
% Mg(OH)2 «= × 100» = 18.0 «%»
Answer must show three significant figures.
[1 mark]