A 0.527-g sample of a mixture containing
NaCO3, NaHCO3, and inert impurities is titrated with 0.109 M HCl, requiring
15.7 mL to reach the phenolphthalein end point and a total of 43.8 mL to reach
the modified methyl orange end point. What is the percent each of Na2CO3 and
NaHCO3 in the mixture?
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