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If you wanted to make a 3 liter solution of 500 mM formic acid buffer at ph 3.9 how many grams each of sodium formate (MW=68g/mol) and formic acid (MW=46g/mol) would you add... 98.6 g sodium formate and 2.3g of formic acid or 20.2 sodium formate and 9.4g formic acid OR 60.5g sodium formate and 28.1 g formic acid

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