Question 1
A saline solution begins to freeze at -1.13 °C. Express the concentration of NaCl in this solution in mass %.
Kf for water is 1.86 °C
m-1.
◦ 3.48%
◦ 1.74%
◦ 0.870%
◦ 17.8%
◦ 8.90%
Question 2
A saturated solution of ammonium sulfate, (NH
4)
2SO
4, in water at 30 °C contains 78.0 g (NH
4)
2SO
4 per 100.0 g H
2O. What is the molality of this solution?
◦ 0.780 m
◦ 1.69 m
◦ 0.590 m
◦ 0.0590 m
◦ 5.90 m