`Ca(OH)^2`

A sample of tap water contains 366 ppm of HCO_(3)^(-) ions with Ca^(2+) ion. Now Ca^(2+) removed by Clark's method by addition of Ca(OH)_2 . Then what minimum mass of Ca(OH)_2 will be required to remove HCO_(3)^(-) ions completely from 500 g of same tap water

A mixture of 100m mol of Ca(OH)_(2) and 2g of sodium sulphate was dissolved in water and the volume was made up to 100 mL. The mass of calcium sulphate formed and the concentration of OH^(-) in resulting solution, respectively, are: (Molar mass of Ca(OH)_(2),Na_(2)SO_(4) and CaSO_(4) are 74, 143 and 136 g mol^(-1) respectively, K_(sp) of Ca(OH)_(2) is 5.5xx10^(-6) )

A mixture of 200 mmol of Ca(OH)_2 and 3g of sodium sulphate was dissolved in water and the volume was made up to 200 mL. The mass of calcium sulphate formed and the concentration of OH^(-) in resulting solution, respectively, are: (Molar mass of Ca(OH)_2 , Na_2SO_4 " and " CaSO_4 are 74, 143 and 136 g mol^(-1) respectively, K_(sp) of Ca (OH)_2 is 5 xx 10^(-6) )