Colligative property measurement is one of the techniques used in the measurement of chemical quantities with reasonable accuracy. If a 40.65 gm sample of K_2SO_4 and BaSO_4 is dissolved in 900 gm of pure water to form a solution 'A' at 57^@C.Its vapours pressure is found to be 39.6 torr while vapour pressure of pure water at 57^@C is 40 torr. Density of solution A is 1.24g/ml. In a different experiment when small amount of pure BaSO_4 is mixed with water at 57^@C it gives the osomotic rise at 4.05xx10^(-5) atm. (R=0.082 Lt.-atm//"mol"-K,K=39,Ba=137,S=32,O=16) Concentration of Ba^(2+) ions in solution 'A' is :

Colligative property measurement is one of the techniques used in the

1.	Colligative property measurement is one of the techniques used in the measurement of chemical quantities with reasonable accuracy. If a 40.65 gm sample of K_2SO_4 and BaSO_4 is dissolved in 900 gm of pure water to form a solution 'A' at 57^@C.Its vapours pressure is found to be 39.6 torr while vapour pressure of pure water at 57^@C is 40 torr. Density of solution A is 1.24g/ml. In a different experiment when small amount of pure BaSO_4 is mixed with water at 57^@C it gives the osomotic rise at 4.05xx10^(-5) atm. (R=0.082 Lt.-atm//"mol"-K,K=39,Ba=137,S=32,O=16) Concentration of Ba^(2+) ions in solution 'A' is :
Answer» `3.5xx10^(-18) M` `4.7xx10^(-15) M` `2.5xx10^(-12) M` `4XX10^(-13) M` Solution :`[SO_4^(2-)]=((29.29/174)/(900+29.29))/1.24xx1/100=0.224` `:. [BA^(2+)]=(5.6xx10^(-13))/0.224=2.5xx10^(-12) M`