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Four solutions have pH values 5, 7, 9 and 11. Which acidic solution among them is least harmful to teeth?

Answer and explanation

Correct answer: Solution with pH 5

On the pH scale, only pH 5 is acidic; pH 7 is neutral, while pH 9 and 11 are basic. Therefore, if the question asks specifically for the acidic solution, option A is the only valid choice. Tooth enamel begins to face increased risk in sufficiently acidic conditions, commonly discussed near pH 5.5, so a lower pH is generally more harmful. The wording should not be read as saying pH 5 is harmless; it is simply the only acidic option listed.

Related tags

PhTooth-EnamelAcidic-SolutionNeutral-SolutionOral-HealthAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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