We have that the correct sentence is
Increasing the volume of an acid solution (increase)the p H of the solution (Unaffected) the pKa of the acid.
Generally
Increasing the volume of an acid solution will automatically increased the pH value to tend to more acidity because of the decrease in the Positive ion concentration
The pKa is unaffected
Hence correct sentence
Increasing the volume of an acid solution (increase)the p H of the solution (Unaffected) the pKa of the acid.
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