CAIE IGCSE Chemistry 10.1.1 Chemical Tests for the Presence of Questions

Work through real CAIE IGCSE Chemistry questions to identify water tests, report colour changes and complete related hydration equations.

Exam points

identify anhydrous copper(II) sulfate and cobalt(II) chloride as tests for water
state the colour changes for the copper(II) sulfate and cobalt(II) chloride water tests
interpret observations and select the correct positive test for water in laboratory situations
name the test compound and complete the hydration equation when required

[Maximum number: 1]

Which statement about water is correct?

It turns anhydrous copper(II) sulfate from pink to blue.

It turns anhydrous copper(II) sulfate from white to blue.

It turns cobalt(II) chloride paper from blue to white.

It turns cobalt(II) chloride paper from pink to blue.

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