Indicators and pHacidbase.jpg

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Litmus is an indicator because it has different in an acid and in a base.
The pH scale runs from 0 to 14 and it measures the of an acidic or basic solution.
A neutral substance has a of 7.
Acids have a pH of than 7 and the lower the pH value, the stronger the acid.
Bases have a pH than 7 and the higher the pH value the stronger the base.
indicator is also used to measure the pH of a solution because it has a different colour at each pH value.