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.
To help you plan your year 7 science lesson on: Separating pure salt from dirty rock salt, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 7 science lesson on: Separating pure salt from dirty rock salt, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 3 science lessons from the Separation techniques unit, dive into the full secondary science curriculum, or learn more about lesson planning.
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