1. Apr 4, 2009

### geffman1

1. The problem statement, all variables and given/known data
hey guys ive got a problem, could ya tell us where i went wrong

Lithopone is a brilliant white pigment used in water-based interior paints. It is a mixture of barium sulfate and zinc sulfide produced by the reaction
BaS(aq) + ZnSO4(aq) ZnS(s) + BaSO4(s)
What mass of lithopone in grams (to 3 significant figures) is produced in the reaction of 227 mL of 0.257 M ZnSO4 and 325 mL of 0.280 M BaS?

MY WORKED SOLUTION"
Mole of BaS=0.280*0.325=0.091mole
mole of ZnSO4=0.0257*0.277=0.0712moles <therefore this is limiting

i dont know what i should take the molarmass of to work out the mass???

anyhelp would be GREATFULLY appreciated.

2. Relevant equations

3. The attempt at a solution

Last edited: Apr 4, 2009
2. Apr 4, 2009

### Staff: Mentor

Check your math. Check it twice, as abvious typo is not the error I am thinking about.

No, 1.93g is not the answer. Probably typo again.

You are on the right track. Find limiting reagent, find moles of both solids that precipitated, find their masses - and as you are looking for a precipitate mass, add them.