Question: You need to make a 25mM fumaric acid buffer with a pH of 3.90. Fumaric acid is a diprotic buffer with pKa1=3.02 and pKa2=4.39. Which

You need to make a 25mM fumaric acid buffer with a

You need to make a 25mM fumaric acid buffer with a pH of 3.90. Fumaric acid is a diprotic buffer with pKa1=3.02 and pKa2=4.39. Which pKa do you use in your Henderson-Hasselbach calculations and why? Draw the relevant structures of fumaric acid showing loss of the appropriate proton

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