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In this video, we explore how we determine the purity of a chemical, using water as as example. We then look at what is meant by a formulation.

This video is based on the AQA spec. If you are following a different exam board then you should check your specification. The Amazon link above is an affiliate link. This provides a small commission which helps to support freesciencelessons. The cost remains the same to you. If you prefer not to use this, you can search Amazon for the Freesciencelessons workbooks.

Deliberate Thought by Kevin MacLeod is licensed under a Creative Commons Attribution licence ([ Ссылка ])
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Image credits:

Silicon Rod: By Warut Roonguthai - Own work, GFDL, [ Ссылка ]

Sodium chloride: "By Ondřej Mangl (Own work) [Public domain], via Wikimedia Commons

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