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1.37g of a mixture of Na(2)CO(3) and NaH...

1.37g of a mixture of `Na_(2)CO_(3) and NaHCO_(3)` was dissolved in water. The solution was titrated with 0.5(M) HCl solution first with phenolphthalein followed by methyl orange indicator. The first and second titrations required 10 mL and 30mL of acid solution respectively. calculate the amounts (in g) of `Na_(2)CO_(3)` and `NaHCO_(3)` present in the mixture.

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