EK #792 Acid/Base Question

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betterfuture

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Which of the following influences the pH of an aqueous solution of a weak base?

The answer was the concentration of the base and the pKb of the base

However, another option said volume of the solution. If concentration is moles/L, then how does volume not effect pH yet concentration can? Doesn't diluting the solution affect the pH if say one adds water?
 
It's talking about the solution, not the solvent. You're correct that adding more solvent would reduce the pH of the solution. However, adding more solution won't.
 
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