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If hydrogen ions are much more numerous than hydroxide ions in a solution, which colour is more likely with universal indicator?

Answer and explanation

Correct answer: Red or orange

When hydrogen-ion concentration is much greater than hydroxide-ion concentration, the solution is acidic and its pH is below 7. Universal indicator shows red at very low pH and orange in a moderately strong acidic range, so red or orange is the most likely colour. Blue and violet indicate alkaline conditions, while green is near neutral. The indicator is not necessarily colourless. Therefore A is correct.

Related tags

Universal IndicatorHydrogen IonsAcidic SolutionAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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