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Phenolphthalein colour in acidic solutions
Colourless
Methyl orange colour in acidic solutions
Red
Phenolphthalein colour in neutral solutions
Colourless
Methyl orange colour in neutral solutions
Orange
Phenolphthalein colour in alkaline solutions
Pink
Methyl orange colour in alkaline solutions
Yellow
Strong acid-strong base and weak acid-strong base indicator
Phenolphthalein
Strong acid-strong base and strong acid-weak base indicator
Methyl orange