Separating a soluble solid from a liquid
I can explain how dissolving can be reversed to separate a soluble solid from a liquid.
Separating a soluble solid from a liquid
I can explain how dissolving can be reversed to separate a soluble solid from a liquid.
Lesson details
Key learning points
- Evaporation can remove solvent from a solution, leading to the production of a saturated solution.
- Crystallisation reforms a solute as crystals from a saturated solution following a change in conditions.
- Solvents evaporate into the air around you during the process of crystallisation.
- Larger crystals form when the solvent evaporates more slowly.
- Heating a solution makes the solvent evaporate more quickly.
Common misconception
Pupils sometimes use the terms evaporation and boiling interchangeably, but they are not the same.
Boiling: a liquid substance is heated & gas bubbles form. Evaporation: same, BUT only on the surface of the liquid & the gas mixes with air.
Keywords
Solute - A solute is a substance that has dissolved into a solvent.
Solvent - A solvent is a liquid into which a solute dissolves.
Evaporation - Occurs when a substance's particles are in the liquid state at its surface with enough energy to change to the gas state and mix with air.
Crystallisation - A process that forms solid crystals from a saturated solution by evaporating the solvent.
Crystal - A crystal is a solid whose particles are arranged in a highly ordered, repeating pattern.
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).
Video
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Starter quiz
6 Questions
When a solid can dissolve in a liquid
When a solid cannot dissolve in a liquid
The mixture formed when a solid dissolves in a liquid
When no more solid can dissolve