Solubility rule

Definition

A rule used to predict whether an ionic compound will dissolve in water.

Used by Edexcel

Specification 3.20 · Paper 1

Use the ions’ charges to write each product’s formula, then apply the solubility rules to both products. Name any insoluble product as the precipitate. In an equation, (aq) means dissolved in water and (s) means solid.
Revise: Predicting Precipitates

1
Check both possible products against the solubility rules, not just the first one you write down.

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GCSE Chemistry · key term

A rule used to predict whether an ionic compound will dissolve in water.

Used by Edexcel

Specification 3.20 · Paper 1

Use the ions’ charges to write each product’s formula, then apply the solubility rules to both products. Name any insoluble product as the precipitate. In an equation, (aq) means dissolved in water and (s) means solid.
Revise: Predicting Precipitates

1
Check both possible products against the solubility rules, not just the first one you write down.

Create a free account to read GCSE Chemistry revision notes for your exam board and track your progress.