A sample of groundwater contains dissolved mineral salts.
Why is this water considered potable even though it is not chemically pure?
The dissolved salts are completely insoluble in water.
The dissolved salts are colourless and do not smell.
The dissolved salts are present at levels that are safe and harmless to consume.
The dissolved salts make the water alkaline.
107 exam-style questions on Edexcel GCSE Chemistry 3.2 Methods of separating and purifying substances, covering 3.2.1 Pure substances and mixtures, 3.2.2 Techniques for separating mixtures, 3.2.3 Paper chromatography and Rf values, and 3.2.4 Making water potable. Each one has a worked solution and a mark scheme showing where the marks go.