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Why is it not correct to identify a colourless solution as acid or base only by looking at it?

Answer and explanation

Correct answer: Many acids and bases can be colourless, so indicators are needed

Colour alone is not a reliable chemical test because many common acids and bases, such as dilute hydrochloric acid and sodium hydroxide solution, are colourless. Their nature must be tested safely with an indicator, pH paper, or a calibrated pH meter. Litmus gives an acid–base indication, while a universal indicator gives an approximate pH range. Therefore A is correct; B and C make false universal claims, and D overstates what appearance can show.

Related tags

Acid Base IdentificationIndicatorsPh PaperAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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