Chemistry 2 dilution problem

  • Thread starter shemer77
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Homework Statement


How much 2M HCl do you have to add to 5 liters of 6 M HCl, to obtain a 3.5 M HCl solution?

The Attempt at a Solution


I initially thought of something like m1v1=m2v2, but that doesn't seem to really work in this case :/?
 

Answers and Replies

  • #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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