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An acidic solution is diluted ten times. If the initial pH was 3, what will be the approximate new pH?

Answer and explanation

Correct answer: Four

For a sufficiently strong acidic solution, pH = −log[H+]. Tenfold dilution reduces the hydrogen-ion concentration by a factor of 10, so the logarithm changes by one unit and the pH increases by approximately 1. Starting from pH 3, the new value is about pH 4. It does not fall to 2, jump to neutral 7, or become the basic value 12.

Related tags

PhDilutionHydrogen-Ion-ConcentrationAcidAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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