3.0 g of impure `Na_2CO_3` is dissolved in water and the solution is made up to `250 mL`. To 50 " mL of " this solution, 50 " mL of " 0.1 N HCL is added and the mixture, after shaking well, required 10 " mL of " 0.16 N NaOH solution for cojmplete neutralisation. Calculate the percentage purity of the sample of `Na_2CO_3`.

1 g of impure Na_(2)CO_(3) is dissolved in water and the solution is made upto 250 mL . To 50 mL of this solution, 50 mL of 0.1 N HCl is added and the mixture after shaking well required 10 mL of 0.16 N NaOH solution for complete neutralization. Calculation percent purity of the sample of Na_(2) CO_(3) .

1 g of impure Na_(2)CO_(3) is dissolved in water and the solution is made upto 250 mL . To 50 mL of this solution, 50 mL of 0.1 N HCl is added and the mixture after shaking well required 10 mL of 0.16 N NaOH solution for complete neutralization. Calculation percent purity of the sample of Na_(2) CO_(3) .

6.5 g mixture of sample containing KOH, NaOH, and Na_2CO_3 was dissolved in H_2O and the volume was made up to 250 mL. 25 " mL of " this solution requires 26.23 " mL of " 0.5 N H_2SO_4 using methyl orange as indicator, and 19.5 " mL of " same H_2SO_4 using phenolphathalein as indicator for complete neutralisation. Calculate the percentage of KOH, NaOH, and Na_2CO_3 in the sample.

6.5 g mixture of sample containing KOH, NaOH, and Na_2CO_3 was dissolved in H_2O and the volume was made up to 250 mL. 25 " mL of " this solution requires 26.23 " mL of " 0.5 N H_2SO_4 using methyl orange as indicator, and 19.5 " mL of " same H_2SO_4 using phenolphathalein as indicator for complete neutralisation. Calculate the percentage of KOH, NaOH, and Na_2CO_3 in the sample.

1.5 g of chalk was treated with 10 " mL of " 4 N HCl. The chalk was dissolved and the solution was made to 100 mL. 25 " mL of " this solution required 18.75 " mL of " 0.2 N NaOH solution for comjplete neutralisation. Calculate the percentage of pure CaCO_3 in the sample of chalk.

1.5 g of chalk was treated with 10 " mL of " 4 N HCl. The chalk was dissolved and the solution was made to 100 mL. 25 " mL of " this solution required 18.75 " mL of " 0.2 N NaOH solution for comjplete neutralisation. Calculate the percentage of pure CaCO_3 in the sample of chalk.

10.875 g of a mixture of NaCI and Na_2CO_3 was dissolved in water and the volume was made up to 250 mL. 20.0 mL of this solution required 75.5 mL of N/10 H_2SO_4 . Find out the percentage composition of the mixture.