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Chemistry

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A chemist is titrating 50.0 mL of 0.180 M HA (pKa = 7.22) with 0.180 M KOH. What is the pH when 25.0 mL of KOH have been added?
A. 7.22
B. 7.58
C. 7.40
D. 7.18

Answer :

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