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Among two acids of equal concentration, one has lower pH and higher conductivity. What type of acid is it likely to be?

Answer and explanation

Correct answer: Strong acid

The relevant concept is the degree of ionisation of acids in water. For equal formal concentrations, a strong acid ionises almost completely and produces a larger concentration of H⁺ ions than a weak acid. The higher H⁺ concentration gives a lower pH, while the greater number of mobile ions generally produces higher electrical conductivity. Thus the described sample is most likely a strong acid, so option B is correct. A weak acid ionises only partially, and the salt or base choices do not fit both observations.

Related tags

Strong AcidConductivityPhAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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