posted by Brittany .
How do I do a question like this please help and explain it!!
Calculate the pH of a buffer solution that contains 0.22 M benzoic acid (C6H5CO2H) and 0.24 M sodium benzoate (C6H5COONa). [Ka = 6.5 × 10-5 for benzoic acid] Round your answer to two places past the decimal.
You use the Henderson-Hasselbalch equation. It's a simple matter of plugging in the numbers and punching into the calculator.