Q29Short answer
On the basis of the equation pH = – log [H ], the pH of 10 mol dm–3 solution of HCl should be 8. However, it is observed to be less than 7.0. Explain the reason.
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Concentration of 10 mol dm indicates that the solution is very dilute. Hence, the contribution of H3O+ concentration from water is significant and should also be included for the calculation of pH.