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To which of the following would the addition of an equal volume of 0.70 M NaOH...

To which of the following would the addition of an equal volume of 0.70 M NaOH lead to a solution having a lower pH?
A. 0.40 M HCl
B. 0.50 M NaNO3
C. Water
D. 0.80 M KOH
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