Hydrated Salts (AQA A-Level Chemistry): Quizzes

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Hydrated Salts
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What are hydrated salts?

Ionic compounds with water in structure

What is the term for water molecules in hydrated salts?

Water of crystallisation

What does 'anhydrous' mean?

Dry form without water

In MgSO47H2OMgSO_4·7H_2O, what does the 7 represent?

7 water molecules per formula unit

Why is heating to constant mass important?

Ensures all water has been removed

What indicates water is completely removed during heating?

Mass no longer decreases

If 4.93 g hydrated salt becomes 2.41 g anhydrous, what mass of water was lost?

2.52 g

What is the molar mass of water (H2OH_2O)?

18.02 g/mol

How should you heat a hydrated salt in practice?

Heat multiple times and weigh each time

What does the process of heating hydrated salts determine?

Number of water molecules per formula unit

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