How do I prepare 500 ml of a .100 mol/L solution of copper sulphate.

Answer 1

get the molmass of the copper sulfate you are using, I suspect it is not copperIIsulfate (anhydrous), but is copperII sulfate pentahydrate.

At any rate, find the mol mass.

Mass needed: molmass*molarity*volumeinliters.

So take that mass (in grams), add water to make up .5liters, stir, label, and store correctly.

Wash equipment, and your hands.