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Concentration problem-with answer

  1. Apr 4, 2009 #1
    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???

    ANSWER IS 1.93 grams

    anyhelp would be GREATFULLY appreciated.



    2. Relevant equations



    3. The attempt at a solution
     
    Last edited: Apr 4, 2009
  2. jcsd
  3. Apr 4, 2009 #2

    Borek

    User Avatar

    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.
     
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