CAIE IGCSE Chemistry 12.1 Experimental design Question Bank

Practise choosing suitable apparatus, judging experimental methods and using solution ideas such as solute, solvent and saturation.

Exam points

choose apparatus for measuring mass, volume, gas volume, temperature and time
describe repeat heating and weighing until a sample reaches constant mass
define a saturated solution using maximum dissolved solute at a stated temperature

Covered syllabus points

12.1.1—Appropriate apparatus for the 12.1.2—Suggest advantages and disadvantages 12.1.3—Solvent dissolves a solute

[Maximum number: 3]

Sulfur is an important element.

(a)

Dilute sulfuric acid is used to make salts known as sulfates.

A method consisting of three steps is used to make zinc sulfate from zinc carbonate.
step 1 Add an excess of zinc carbonate to $20 \mathrm{~cm}^{3}$ of $0.4 \mathrm{~mol} / \mathrm{dm}^{3}$ dilute sulfuric acid until the reaction is complete.
step 2 Filter the mixture.
step 3 Heat the filtrate until a saturated solution forms and then allow it to crystallise.

[ 3 ]

(i)

Name a suitable piece of apparatus for measuring $20 \mathrm{~cm}^{3}$ of dilute sulfuric acid in step 1.

[ 1 ]

(ii)

What is meant by the term saturated solution in step 3?

[ 2 ]

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Covered syllabus points

12.1 Experimental design question 1

Question (a)

Question (i)

Question (ii)