GCSE Chemistry – Potable Water – Treating Freshwater | Desalinating Seawater (2026/27 exams)

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*** WHAT’S COVERED ***
1. Potable Water Explained
* The definition of potable water as water that is safe to drink.
* The key differences between pure water and potable water.
* The three essential criteria for water to be classified as potable, including levels of dissolved substances, pH range, and the absence of microorganisms.
2. Obtaining Potable Water from Fresh Water
* An overview of fresh water sources like surface water (rivers, lakes) and groundwater (aquifers).
* The multi-step process for treating fresh water to make it potable.
* Methods of filtration to remove solid particles.
* Sterilisation techniques, including the use of chlorine, ozone, and ultraviolet light to kill harmful microbes.
3. Desalination of Sea Water
* An explanation of desalination as a method to produce potable water, particularly in regions with low rainfall.
* A description of desalination through distillation.
* An explanation of desalination using reverse osmosis.
* The challenges of desalination, including high energy requirements and cost.

*** CHAPTERS ***
0:00 Introduction to Potable Water
0:25 Pure Water vs Potable Water
0:46 Criteria for Potable Water
1:16 Sources of Fresh Water
2:27 Treating Fresh Water
2:39 Filtration and Sedimentation
2:56 Sterilisation of Fresh Water
3:14 What is Desalination?
3:40 Desalination by Distillation
4:20 Desalination by Reverse Osmosis

*** PLAYLISTS ***

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