what is the percentage by mass of NaCl in a saturated solution of sodium chloride at 50 degrees celsius

Question

I need to show work but I do not know how to work this problem out

Answer 1

36.69 g/100 ml is the solubility of NaCl at 50^oC.  You would have to look this up in a table.

 

To obtain % by mass, you take the mass of NaCl divided by the total mass x100%

Density of H2O at 50^o is about 0.988 g/ml

Thus 100 ml H2O at 50^o = 100 ml x 0.988 g/ml = 98.8 g

Mass NaCl = 36.69 g

Total mass = 36.69 g + 98.8 g = 135.49 g

mass % NaCl = 36.69 g/135.49 g (x100%) = 27.1% (to 3 significant figures)