| Date | May 2018 | Marks available | 1 | Reference code | 18M.2.hl.TZ2.1 |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | Outline | Question number | 1 | Adapted from | N/A |
Question
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.
Outline why repeating quantitative measurements is important.
Markscheme
to reduce random errors
OR
to increase precision
Accept “to ensure reliability”.
[1 mark]
Examiners report
[N/A]
Syllabus sections
Core » Topic 1: Stoichiometric relationships » 1.1 Introduction to the particulate nature of matter and chemical change
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