Solutions

I can explain how solutions are formed and how to use state symbols in equations.

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Year 10

OCR

Foundation

Solutions

I can explain how solutions are formed and how to use state symbols in equations.

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Share activities with pupils

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Lesson details

Key learning points

A solution is a type of mixture made of a solvent and a solute.
Solutions form due to a solute dissolving in the solvent.
Solubility is a measure of how well a chemical dissolves (soluble/insoluble).
Many substances can act as a solvent; however, water is the most common.
State symbols are used to identify the three states of matter and aqueous solutions in chemical equations.

Keywords

Solute - A solute is a substance that has dissolved into a solvent.
Solvent - A solvent is a liquid into which a solute dissolves.
Soluble - When a substance dissolves in a solvent, it is described as soluble in that solvent.
Insoluble - A substance that does not dissolve in a particular solvent is described as insoluble.
State symbol - A state symbol is used in chemical equations to indicate the physical state of a substance.

Common misconception

Some think that because a solute can no longer be seen, or that a solvent becomes coloured when a solute dissolves, that the creation of a solution is a chemical change.

Create a salt solution, then evaporate the water (leaving salt crystals) to demonstrate that the salt and water have not chemically combined and therefore dissolving (to create a solution) is a physical change.

Create a circus of stations in which pupils create solutions of various solid and liquid solutes and various solvents. Challenge pupils to describe the solution in an equation format, using state symbols.

Teacher tip

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).