Solutions
I can explain how solutions are formed and how to use state symbols in equations.
Solutions
I can explain how solutions are formed and how to use state symbols in equations.
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.
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).
Lesson video
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Starter quiz
6 Questions
Exit quiz
6 Questions
solid
liquid
gas
dissolved in water