MES (C, H13NO,S) s commonly used as a buffer in biology and biochemistry. It has a pk, of 6.15 at 20°C. Calculate the mass (in g) of MES (HA in the Henderson-Hasselbalch equation) needed to obtain 100 mL of a 0.100 M MES buffer (total buffer concentration) with a pH of 5.9. Note: Although you will use different buffer systems and a different pH in lab, this is the same math that you will be using for lab. Report your answer to three places after the decimal.

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