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If methyl orange is red and phenolphthalein is colourless, what should be added to neutralise the solution?

Answer and explanation

Correct answer: Base

The governing concept is neutralisation, in which an acid reacts with a base to form salt and water. Red methyl orange shows that the solution is acidic; colourless phenolphthalein is also consistent with an acidic or neutral medium. Therefore, adding a suitable base will consume excess hydrogen ions and move the solution toward neutrality. More acid would worsen the condition, while sugar and sodium chloride do not neutralise the acid.

Related tags

IndicatorNeutralisationAcidAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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