CAIE IGCSE Chemistry 13.2.1 Select and Safely Use Techniques and Apparatus Questions

Work through real CAIE IGCSE Chemistry questions to choose safe techniques, suitable materials, heating methods and measurement checks.

Exam points

select suitable apparatus and repeat heating and weighing until a constant mass confirms that water has been removed
select inert and conducting electrode materials such as platinum for electrolysis
identify hazards and choose safe heating or handling procedures for flammable mixtures and reactive metals
follow ordered experimental instructions and state appropriate personal protective equipment or safety controls

[Maximum number: 2]

Hydrated cobalt(II) sulfate, $\mathrm{CoSO}_{4} \cdot \mathrm{x} \mathrm{H}_{2} \mathrm{O}$ , produces water when it is heated.

\mathrm{CoSO}_{4} \cdot \mathrm{xH}_{2} \mathrm{O}(\mathrm{~s}) \rightarrow \mathrm{CoSO}_{4}(\mathrm{~s})+\mathrm{xH}_{2} \mathrm{O}(\mathrm{~g})

A student does an experiment to determine the value of x in $\mathrm{CoSO}_{4} \cdot \mathbf{x} \mathrm{H}_{2} \mathrm{O}$ .
step 1 The student weighs a sample of hydrated cobalt(II) sulfate.
step 2 The student heats the sample of hydrated cobalt(II) sulfate.
step 3 The student weighs the remaining solid after heating.

Describe what else the student should do to ensure that all the water has been given off. No other substances are required.

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CAIE IGCSE Chemistry 13.2.1 Select and Safely Use Techniques and Apparatus Questions question 1