1. Not finding help here? Sign up for a free 30min 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!

Dilution Chemistry Problems i dont get it >.<

  1. Nov 30, 2007 #1
    ok, our teacher showed us a ton of stuff today, includeing molarity and dilution. i understand molarity but not dilution...any help please?

    1. The problem statement, all variables and given/known data
    the problems are all like this:
    *0.005 L of 1.0 M Hcl is diluted w/ water to 0.125 L
    *100.0 ML of 2.0 M HCL is diluted with water to 200 mL.
    etc...

    3. The attempt at a solution
    now, the formula given is M1V1=M2V2

    so i would:
    0.005L*0.125L=10L*20L
    ?
    for some reason that looks wrong, but like i said, i just dont get it...the teach was a sub, and made it all confusing-like <.<

    any help would be appreciated...
     
  2. jcsd
  3. Nov 30, 2007 #2
    well you interpreted all the variables incorrectly

    [tex]M_{1}=\mbox{Molairty}_{\mbox{initial}}[/tex]

    [tex]M_{2}=\mbox{Molarity}_{\mbox{final after dilution}}[/tex]

    [tex]V_{1}=\mbox{Volume}_{\mbox{initial}}[/tex]

    [tex]V_{2}=\mbox{Volume}_{\mbox{final after dilution}}[/tex]

    so to answer your first question

    [tex]M_{1}=\mbox{1.0 M HCL}[/tex]
    [tex]V_{1}=0.005L[/tex]

    [tex]V_{2}=0.125L[/tex]

    and so, all you need to do is solve for final Volume

    [tex]M_{1} \times V_{1} = M_{2} \times V_{2}[/tex]

    *also, always pay attention to your final units
     
    Last edited: Nov 30, 2007
  4. Nov 30, 2007 #3
    It looks to me like your trying to use Boyles Law P1V1=P2V2, I dont think that applies to your problem. Other thing I noticed is the you converted 100ML to 10L, it should be .1L

    Also it seems as though part of the question is missing.
     
  5. Nov 30, 2007 #4
    Boyle's Law has nothing to do with this problem. He is simply looking for the final Molarity after dilution.
     
    Last edited: Nov 30, 2007
  6. Nov 30, 2007 #5
    Ok, My bad.
     
  7. Nov 30, 2007 #6
    Is ok, I'm in Organic 1 and I'm currently reading General Chemistry by Linus Pauling :-] There is still a lot to learn.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Dilution Chemistry Problems i dont get it >.<
  1. I dont get ithelp! (Replies: 1)

Loading...