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4 g of a mixture of Na(2)SO(4) and anhyd...

4 g of a mixture of `Na_(2)SO_(4)` and anhydrous `Na_(2)CO_(3)` were dissolved in pure and volume made up to 250 mL. 20 mL of this solution required 25 mL of `N//5 H_(2)SO_(4)` for complete neutralisation. Calculate the percentage composition of the mixture.

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The correct Answer is:
`Na_(2)CO_(3)=82.8%; Na_(2)SO_(4)=17.2%`
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