Question

An Aqueous solution of HCl is
${10}^{ - 9} M \:$
.The pH of the solution will be ?

Answer 1

The pH of of HCL is less than 7 because HCL is in aqueous medium it is acidic in nature.

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Answer 2

☆Solution is $\red{Aqueous}$

Since, concentration of solution is ≤ 10^(-7)
so we have to go with self ionization of water.


${H}^{ + } = {10}^{ - 9} + {10}^{ - 7} \\ = {10}^{ - 7} (1 + {10}^{ - 2} ) \\ pH = - log( {10}^{ - 7} (1 + {10}^{ - 2} ) ) \\ = 7 - log(1.01)$
➡️pH will be less than 7.

Hope it will help you✔️