A is a stable powder
B is water
C is the product of the powder being in contact with water.
A is soluble in substance B and for every gram of A 10% is C.
For a concentration of 0.5ppm of C in twenty liters of water how many grams of A do you need?
The Attempt at a Solution
I went on the assumption that ppm=mg/l.
So 0.5ppm=0.5mg/l, and I would need 10mg for the twenty liters
Which means that I would need 100mg of A.
Is this correct?