Have a go at the following question.

You are given the solubility expressions for six solid solutes.
Drag the solutes to the table so that they appear in order of solubility.


Caffeine:
soluble in 60 parts of water
Cetrimide:
soluble in 2 parts of water
Heparin Sodium:
soluble in 2.5 parts of water
Morphine Sulphate:
soluble in 21 parts of water
Papaverine Hydrochloride:
soluble in 40 parts of water
Sorbitol:
soluble in 0.5 parts of water
Most Soluble in Water
Least Soluble in Water


The basic equation for calculating percentages is:

Percentage =      Amount of Specific Item      x 100%
Total Amount Of All Items


You need to be able to calculate all three parts of this equation given two of the others ie you need to be able to calculate:

  1. percentage
  2. the amount of a specific item
  3. the total amount of all items

You can do all the calculations using arrangements of this one equation.