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pH indicators by Mind Map: pH indicators
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pH indicators

pH scale

has a set of numbers 1-14

used to indicate whether solution is acidic, alkaline or neutral

acids have pH values less than 7

alkalis have pH values more than 7

a neutral soln (eg a salt soln or water) has a pH value of 7

pH is used to compare strength of acid and alkali

indicators

are substances that change colour when acidic or alkaline soln added to them

Universal indicator

Methyl Orange

Litmus paper

phenolphthalein