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A student needs to prepare a lactic acid buffer at a pH of 4.85. The student...

A student needs to prepare a lactic acid buffer at a pH of 4.85. The student has available lactic acid (pKa = 4.20), a 0.830 M KOH solution and a 0.830 M HCl solution. Will the student need to add KOH or HCl to the lactic acid in order to prepare the buffer?

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Calculate the volume (in mL) of the solution that should be added to 3.166 g of lactic acid (FW 122.12 g/mol, pKa = 4.20) to give a pH of 4.85.

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