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Why can it be wrong to decide whether a colourless solution is an acid or a base just by looking at it?

Answer and explanation

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

The governing concept is chemical identification using indicators rather than appearance. Many common acids and bases, such as dilute hydrochloric acid and sodium hydroxide solution, are colourless. Litmus, universal indicator, or pH paper undergoes a characteristic colour change that provides evidence about acidic or basic nature. Thus option A is correct; no fixed visible colour applies to every acid or base, and colour alone cannot give exact pH.

Related tags

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

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