1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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


    User Avatar
    Homework Helper
    Education Advisor
    Gold Member

    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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook