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Chemistry 2 dilution problem

  1. Nov 13, 2011 #1
    1. The problem statement, all variables and given/known data
    How much 2M HCl do you have to add to 5 liters of 6 M HCl, to obtain a 3.5 M HCl solution?

    3. The attempt at a solution
    I initially thought of something like m1v1=m2v2, but that doesn't seem to really work in this case :/?
     
  2. jcsd
  3. Nov 13, 2011 #2

    symbolipoint

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    How many moles of HCl do you need in the target solution when finished, and how much volume must it be?

    Let V = volume of 2M HCl to add. Final solution volume to make is V+5 liters.
    Moles of HCl in final prepared solution are 2*V + 6*5 moles.

    Analyze the situation and construct the needed equation and solve.
     
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