A sample of 10 g of a mixture of sodium ...

A sample of 10 g of a mixture of sodium chloride and anhydrous sodium sulphate of dissolved in water. When an excess of barium chloride solution is added, 6.99 g of barium sulphate is precipitated according to the equation: `Na_(2)SO_(4)+BaCl_(2)to BaSO_(4)+2NACl`. Calculate the percentage of sodium sulphate in the original mixture. (O = 16, Na = 23,S = 32, Ba = 137)

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(i) `4.26 g NaSO_(4)" "(ii) 42.6% Na_(2)SO_(4)`

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