Solubility rules
I can remember, and apply, the solubility rules to know whether a salt formed is soluble or insoluble.
Solubility rules
I can remember, and apply, the solubility rules to know whether a salt formed is soluble or insoluble.
Lesson details
Key learning points
- There are a list of general rules which describe the solubility of common types of substances in water.
- Reactions that form insoluble products are called precipitation reactions; the solids formed are called the precipitate.
- When two soluble salts are mixed together, sometimes they will rearrange to create an insoluble salt.
- Solubility rules can be used to identify which two solutions are needed to mix in order to create an insoluble salt.
Common misconception
All salts are either completely soluble or completely insoluble in water.
Not all salts follow a strict 'soluble' or 'insoluble' rule. Some salts have limited solubility, meaning they dissolve only to a certain extent. Solubility rules help us predict the solubility of common salts, but there are always exceptions.
Keywords
Solubility - The ability of a substance to dissolve in a particular solvent creating a solution; how well a solute dissolves in a solvent.
Salt - An ionic compound, usually formed by neutralisation of an acid by a base.
Soluble - When a substance dissolves in a liquid, it is described as soluble in that liquid.
Precipitate - An insoluble solid formed when two solutions react together.
Insoluble - When a substance does not dissolve in a liquid, it is described as insoluble in that liquid.
Equipment
Solutions of: AgNO₃, NaCl, BaCl₂, FeCl₂, NaOH, Na₂SO₄, H₂SO₄. CaCO₃ powder, test tubes.
Content guidance
- Risk assessment required - equipment
Supervision
Adult supervision required
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
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