A mixture of 100 ml mol of Ca(OH)2 and 2 g 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 , Na2 SO4 and CaSO4 are 74, 143 and 136 g mol–1, respectively ; Ksp of Ca(OH)2 is 5.5 × 10–6)
(1) 13.6 g, 0.14 mol L–1
(2) 1.9 g, 0.28 mol L–1
(3) 13.6 g, 0.28 mol L–1
(4) 1.9 g, 0.14 mol L–1
