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How many grams of glyoxylic acid and sodium glyoxylate are needed to prepare 2.00 L of...

How many grams of glyoxylic acid and sodium glyoxylate are needed to prepare 2.00 L of a 1.30 M buffer at pH 4.00? The pKa of glyoxylic acid is 3.34. Note: Use the monohydrate forms, HCOCO2H·H2O and HCOCO2Na·H2O.

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