Separating pure salt from dirty rock salt
I can suggest how to combine separation techniques in order to separate pure salt from a sample of rock salt.
Separating pure salt from dirty rock salt
I can suggest how to combine separation techniques in order to separate pure salt from a sample of rock salt.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- The properties of the substances in a mixture help to determine the technique best suited to separate them.
- When mixtures contain more than two components, multiple techniques may be needed to separate them.
- Creating a solution of an existing mixture can allow a specific technique to be used for separation.
- Separating salt from rock salt requires: making a solution, filtration, and crystallisation.
Keywords
Separation technique - A process or method used to isolate a substance from a mixture, usually to obtain a pure sample of it.
Property - A property is a feature or characteristic of a substance that can be used to classify it, or describe how it behaves.
Soluble - When a substance dissolves in a liquid it is described as soluble in that liquid.
Insoluble - An insoluble substance is one that will not dissolve in a particular solvent.
Common misconception
Filtration alone can separate salt from rock salt - idea that only one technique is needed.
Highlight that each separation technique (so far) creates two products; one of them may still be a mixture that requires further separation.
Content guidance
- Depiction or discussion of sensitive content
- 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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