C3: Water

Hey, here is a document mainly for students taking AQA Triple Science. It has information from the C3 (chemistry) section on drinking water, soft water, hard water and the water cycle. I hope this helps you to revise! Please rate and comment on how to improve :D

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C3: Drinking Water

The water we drink is not pure water because it contains dissolved
substances.

It should be safe to drink, which means it does not contain
anything that could cause us harm.

Some of the dissolved substances are beneficial to our health but
some cause hard water.

The…

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The solubility of a solute in water, or any other solvent, is usually
given in grams of solute per 100 grams of water (or solvent) at
that temperature.

The solubility of most solutes that are solids increases as the
temperature increases.

A saturated solution is one in which no more…

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Hard water reacts with soap to form scum and so more soap is
needed to form lather.

Hard water contains dissolved compounds, usually of calcium or
magnesium.

The compounds are dissolved when water comes into contact
with rocks.

Using hard water can increase costs because more soap is
needed.

When…

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Pure water can be produced by distillation.


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