Difference between revisions of "Identifying Pure Substances"
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===Meaning=== | ===Meaning=== | ||
| − | '''Identifying Pure Substances''' is a set of [[method]]s that can be used to determine if a [[substance]] is a [[mixture]] of other [[ | + | '''Identifying Pure Substances''' is a set of [[method]]s that can be used to determine if a [[substance]] is a [[mixture]] of other [[substance]]s or whether it is pure. |
===About Identifying Pure Substances=== | ===About Identifying Pure Substances=== | ||
Latest revision as of 19:32, 3 April 2019
Key Stage 3
Meaning
Identifying Pure Substances is a set of methods that can be used to determine if a substance is a mixture of other substances or whether it is pure.
About Identifying Pure Substances
- To identify if a substance is pure the experimenter should try several separation techniques.
To find if a liquid is pure:
- 1. Filter the substance. If a residue is left in the filter paper, then the substance is not pure.
- 2. Distill the substance. If a material is left behind during distillation then it is not pure.
To find if a solid is pure:
- 1. Dissolve the solid in a solvent.
- 2. Place a drop of the solution on chromatograph paper and use the same solvent to complete a chromatography experiment. If two or more separate patches appear, then it is not pure.