Question

A hard water sample contains 0.0085% Ca by mass (in the form of Ca2+ ions). How much water (in grams) contains 1.2 g of Ca?

Answer 1

0.0085 : 100 g = 1.2 : x
x = mass solution = 1.41 x 10^4 g

Answer 2

Thanks for the response, @arronq - it cleared up my confusion! :)