A buffer solution after the addition of 20.0 mL of 1.00 M NaOH solution to 500.0 mL of a buffer solution containing 0.20 M acetic acid (CH3COOH) and 0.30 M sodium acetate (CH3COONa).  [Ka= 1.8 × 10–5]   What is the pH of the buffer solution?   a 4.41      b 4.74      c 4.56    d 4.92    e 5.07

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