BRAINCAKEAcid-Base Indicators
An acid-base indicator is a weak acid which is one colour in its un-ionised form and another in its dissociated form.
HInd &rlhar H+ + Ind-
For methyl orange HInd is red and Ind- is yellow. For Litmus HLit is blue and Lit- is red. For phenolphthalein HInd is purple and Ind- is colourless.
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More in Acids, Bases and Buffers
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All 16 lessons in Acids, Bases and Buffers · All Edexcel A-level Chemistry topics