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Homework Help: Help on chemistry problem

  1. Sep 9, 2010 #1
    1. The problem statement, all variables and given/known data
    Want to prepare 450.0 mL of a 145 ppm K + ion solution. density of solution is 1.01 g/mL. solution is .728 M in K2SO4. How many mL of the K2SO4 solution need to use?


    2. Relevant equations



    3. The attempt at a solution

    (.728 mol/L K2SO4 )(1.01g/mL)(450.0 mL)

    i dont know what to do next...help?
     
  2. jcsd
  3. Sep 10, 2010 #2

    Borek

    User Avatar

    Staff: Mentor

    This is a simple mass conservation.

    How much potassium will be present in the final solution?

    What volume of the starting solution contains this amount of potassium?
     
    Last edited by a moderator: Aug 13, 2013
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