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: What is the Molarity of 70% TBHP?

  1. Aug 13, 2012 #1
    1. The problem statement, all variables and given/known data
    What is the Molarity of 70% TBHP?

    2. Relevant equations
    Given: d=.937g/ml, FW=90.12g , w/w%?

    3. The attempt at a solution
    1000mL x (0.937g/mL) x (1mol/90.12g) = 10.4M

    That is what I got but idk what to do with the 70% or that w/w%
    or is that right the way I did it?
  2. jcsd
  3. Aug 13, 2012 #2


    User Avatar
    Science Advisor

    "Molarity of 70%" means .7 times one molarity. Do you know what a one molarity solution would be?
  4. Aug 13, 2012 #3
    So this is what I came up with now:

    1000mL x (0.937g/mL) x (.7) x (1mol/90.12g) = 7.28mol/L

    Is this correct now?
  5. Aug 13, 2012 #4


    User Avatar
    Gold Member

    If they are asking the molarity and they have given you density, then it is definitely w/w%
  6. Aug 14, 2012 #5


    User Avatar

    Staff: Mentor

    No, in this context it means molarity of 70% solution of TBHP, 70% being most likely w/w.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook