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(D) The $pH$ of a solution is determined by the concentration of $H^+$ ions,which is defined as $pH = -\log[H^+]$.Adding pure water (options $A$ and $

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$20 \ mL$ of the same dilute $HCl$

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(D) The $pH$ of a solution is determined by the concentration of $H^+$ ions,which is defined as $pH = -\log[H^+]$.Adding pure water (options $A$ and $B$) will dilute the solution,decreasing the concentration of $H^+$ ions and thus increasing the $pH$.Adding concentrated $HCl$ (option $C$) will increase the concentration of $H^+$ ions,thus decreasing the $pH$.Adding more of the same dilute $HCl$ (option $D$) does not change the concentration of $H^+$ ions in the solution,as the ratio of moles to volume remains constant. Therefore,the $pH$ remains unchanged.

Which of the following,when added to $10 \ mL$ of dilute $HCl$,will not change the $pH$ of the solution?

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