The pH of a 10^{-9} M solution of HCl in wat | vedclass

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(D) Since the solution is acidic,the $pH$ must be less than $7$. For a very dilute solution of $HCl$ $(10^{-9} \ M)$,the concentration of $H^{+}$ ions

Vedclass · Accepted Answer

Between $6$ and $7$

Vedclass · Answer

(D) Since the solution is acidic,the $pH$ must be less than $7$. For a very dilute solution of $HCl$ $(10^{-9} \ M)$,the concentration of $H^{+}$ ions from the dissociation of water $(10^{-7} \ M)$ cannot be ignored. The total $[H^{+}] = [H^{+}]_{HCl} + [H^{+}]_{H_2O} = 10^{-9} + 10^{-7} = 1.01 	imes 10^{-7} \ M$. Therefore,$pH = -\log(1.01 	imes 10^{-7}) \approx 6.996$,which lies between $6$ and $7$.

The $pH$ of a $10^{-9} \ M$ solution of $HCl$ in water is

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