Solubility problems
Answers are for parents and teachers.
1
If S = 45, how many grams of salt are needed to saturate 280 g of water?
126
2
42 g of a salt dissolve in 210 g of water to give a saturated solution. Find S.
20
3
S = 160 at 70 °C and S = 20 at 10 °C. How many grams of salt crystallise when 260 g of saturated solution at 70 °C is cooled to 10 °C?
140
4
40 g of water are evaporated from 250 g of saturated solution with S = 25. How many grams of salt separate?
10
5
Why is solubility given per 100 g of water rather than per solution?
The solvent mass gives a common basis for comparison, while the mass of the solution changes with the amount dissolved.