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Methyl orange is red and phenolphthalein is colourless in a solution. Which substance is suitable to neutralise it?

Answer and explanation

Correct answer: Sodium hydroxide solution

Methyl orange is red in a strongly acidic medium, while phenolphthalein remains colourless in acidic and neutral solutions. Together these observations indicate that the unknown solution is acidic. Neutralisation requires an alkali to supply hydroxide ions that react with hydrogen ions to form water. Sodium hydroxide is therefore suitable, making option A correct. Vinegar, lemon juice, and dilute acid would add more acid rather than neutralise it.

Related tags

Acid-Base IndicatorsNeutralisationSodium HydroxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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