DP Chemistry (last assessment 2024)

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Question 18M.2.hl.TZ2.g

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.2.hl.TZ2.g
Level hl Paper 2 Time zone TZ2
Command term Outline Question number g Adapted from N/A
g.
[Maximum mark: 1]
18M.2.hl.TZ2.g

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.

[1]

Markscheme

to reduce random errors

OR

to increase precision

 

Accept “to ensure reliability”.

[1 mark]

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