1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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 Question

  1. Oct 4, 2007 #1
    1. Concentrated h2so4 solution is 98% by weight and has a density of 1.84% g/mL . A volume of 21.75 mL of this solution was diluted to 500 mL and has a density of 1.09 g/mol. What is the molarity of the resulting solution?

    2. M1V1 = M2V2
    molarity = moles/litres which is also = grams of solutes / MM x litres of solution

    3. Well basically this is my approach but i know im missing something because I dont even use all the values in the question given

    98g/100g x 1.84 g/mL x 1000mL/1L x 1mol/98.03g = M1 = 18.39 M

    v1 = 21.75 mL = 0.02175 L

    v2 = 500 mL = .5 L

    So now i just calculate M2

    but then why is the denisty of the diluted solution given ???
    Last edited: Oct 4, 2007
  2. jcsd
  3. Oct 4, 2007 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    It is unnecessary. But if you wish, you can also find the final density and see how it compares with the number they gave you. Hopefully, it'll be pretty close.
  4. Oct 4, 2007 #3
    so what i did was correct?

    thats how to find MOLARITY of the resulting solution.
  5. Oct 4, 2007 #4


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Yes, your calculation will give the correct answer (for final molarity).
  6. Oct 5, 2007 #5
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - Dilution Question Date
Quick silly dilution question Sep 17, 2014
Simple solutions question (dilution) Nov 4, 2012
Dilution question May 12, 2010
Dilution Question Sep 13, 2009
Dilutions question May 3, 2009