How many grams of dipotassium oxalate mw16622 should be, Ask an Expert

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How many grams of dipotassium oxalate (M.W.=166.22) should be addedto 20.671 mL of 0.7097 M HClO4 to provide a solutionwith a pH value of 5.6919 when the solution is diluted to 44.517mL? [Note for oxalic acid, a diprotic weak acid,pK1=1.4206 and pK2=6.0200].

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