Question

100 g of NaCl is stirred in 100 mLof water at 20°C till the equilibrium is attained : 

(a) How much NaCl goes into the solution and how much of it is left undissolved at equilibrium? The solubility of NaCl at 20°C is 6.15 mol/litre. 

(b) What will be the amount of NaCl left undissolved if the solution is diluted to 200 mL?

Answer 1

Solubility of NaCI =6.15 mol/litre

(a) Thus amount of NaCl in 100 mL at 20°C get dissolved = 36 g and amount of NaCl in 100 mL at 20°C remained undissolved = 100-36 = 64 g

(b) If volume of solution is diluted to 200 mL, 36 g more of NaCl will be dissolved leaving only 28 g NaCl dissolved in 200 mL.