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(D) The $pH$ value is defined as the negative logarithm of the hydrogen ion concentration,represented by the formula: $pH = -\log[H^+]$.As the concent

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Decrease

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(D) The $pH$ value is defined as the negative logarithm of the hydrogen ion concentration,represented by the formula: $pH = -\log[H^+]$.As the concentration of hydrogen ions $[H^+]$ increases,the value of $\log[H^+]$ also increases.Since the $pH$ is the negative of this value,an increase in $[H^+]$ leads to a decrease in the $pH$ value.Therefore,a higher concentration of hydrogen ions indicates a more acidic solution,which corresponds to a lower $pH$ value.

With the increase in the concentration of hydrogen ions,the $pH$ value will

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