Question

Solubility of sodium chloride in water at27C is 22.7g in 100ml. Density of water is 1g per ml. Calculate the concentration of sodium chloride in terms of mass percent when it is dissolved in 500 ml of water

Answer 1

if the temperature is also 27°c so the presence of Na will be 113.5g.

Answer 2

Density = (mass/volume)

Given, density of water = 1 gm/ml; volume of water = 500 ml

Thus, mass of water = 1 X 500 gm = 500 gm

Solubility of NaCl = 22.7 gm/100 ml water.

Thus, in 500 ml water, mass of NaCl present will be

= (22.7 X 500)/100 = 113.5 gm

Therefore mass percent of NaCl = (113.5/500) X 100% = 22.7%