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A sample may contain Na2CO3 (105.989 g/mol), NaHCO3 (84.007 g/mol), NaOH (39.977 g/mol) or a compatible...

A sample may contain Na2CO3 (105.989 g/mol), NaHCO3 (84.007 g/mol), NaOH (39.977 g/mol) or a compatible mixture of these bases. A 0.8412-g sample titrated directly to the methyl orange endpoint required 45.38 mL of 0.1320 M HCl. Another 0.8412-g sample was titrated to the phenolphthalein endpoint with the same acid. It required 28.32 mL acid.

(a) What base(s) are present in the sample?
(b) What is/are the percentage(s) of the base(s) in the sample?

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