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A buffer contains 0.30 mol CH3COOH (Ka = 1.8 x 10-5) and 0.50 mole CH3COONa in...

A buffer contains 0.30 mol CH3COOH (Ka = 1.8 x 10-5) and 0.50 mole CH3COONa in 1.00L.   What's the pH after the addition of 0.05 mole KOH?

A. 4.74

B. 5.08

C. 3.96

D. 4.51

E. 5.42

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