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In a solution, red litmus turns blue and turmeric becomes reddish-brown. Which ion is likely to be in excess?

Answer and explanation

Correct answer: Hydroxide ion

Red litmus turning blue indicates that the solution is basic. Turmeric also changes from yellow to reddish-brown in the presence of a base, confirming the same conclusion. In aqueous school-level acid-base theory, basicity is associated with an excess concentration of hydroxide ions, OH⁻, rather than hydrogen ions. Chloride and sulphate ions alone do not explain these indicator changes. Hence option B is correct.

Related tags

TurmericBaseHydroxide-IonIndicatorsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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