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Methyl orange is yellow and phenolphthalein is pink in a solution. Which ion is likely to be in excess?

Answer and explanation

Correct answer: Hydroxide ion

Phenolphthalein is pink in a basic medium and colourless in an acidic or neutral medium. Methyl orange is yellow in a neutral or basic medium, so the two observations together indicate that the solution is basic. In a basic aqueous solution, hydroxide ions are present in excess relative to hydrogen ions. Chloride and sulphate ions do not determine this indicator combination. Therefore option B is correct.

Related tags

IndicatorsHydroxide IonsBasic SolutionMethyl OrangeAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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