1.249 g of a sample of pure BaCO_(3). and impure CaCO_(3) containing some CaO was treated with dil . HCl and it evoled 168 ml of CO_(2)at NTP . From this solution , BaCrO_(4) was precipitated , filtered and washed . The precipitate was dissolved in dilute sulphauric acid and diluted to 100 ml. 10 ml of this solution , when treated with Kl solution , liberated iodine which required exactly 20 ml of 0.05 ml of 0.05 N Na_(2)S_(2)O_(3). Calculate the percentage of CaO in the sample.

1.249 g of a sample of pure BaCO_(3). and impure CaCO_(3) containing s

1.	1.249 g of a sample of pure BaCO_(3). and impure CaCO_(3) containing some CaO was treated with dil . HCl and it evoled 168 ml of CO_(2)at NTP . From this solution , BaCrO_(4) was precipitated , filtered and washed . The precipitate was dissolved in dilute sulphauric acid and diluted to 100 ml. 10 ml of this solution , when treated with Kl solution , liberated iodine which required exactly 20 ml of 0.05 ml of 0.05 N Na_(2)S_(2)O_(3). Calculate the percentage of CaO in the sample.
Answer» SOLUTION :N/A