Acids and bases are two families of chemicals with opposite properties. This unit covers the pH scale, how to spot acids and bases, and the salts they make when they react.
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The pH scale
The pH scale runs from 0 to 14 and measures how acidic or alkaline a solution is.
A pH below 7 is acidic and a pH above 7 is alkaline.
A pH of exactly 7 is neutral, like pure water.
Universal indicator gives a range of colours to show the pH.
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1. A solution with a pH of 7 is best described as what?
2. What is produced when an acid reacts with an alkali?
3. What is produced when an acid reacts with a metal?
4. What colour does blue litmus paper turn in an acid?
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