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!

A problem in volumetric calculations in Chemistry

  1. May 23, 2017 #1
    1. The problem statement, all variables and given/known data:

    The density of a 2.05 molar solution of acetic acid is 1.02g/ml. The Molality of the solution is:

    (a) 1.14 mole/kg
    (b) 3.28 mole/kg
    (c) 2.28 mole/g
    (d) 0.44 mole/kg

    2. Relevant equations:

    3. The attempt at a solution:

    I tried it out very simply using unitary method:

    Molality is the number of moles of solute in 1000g of solvent.

    1.02g acetic acid has 1ml volume.

    So, 1000g acetic acid has 1000/1.02 ml volume.

    1000ml acetic acid soln. has 2.05 moles of the acid.

    So, 1000/1.02 ml has 2.05/1.02 moles = 2moles.

    This answer doesn't match with any answer. Where am I wrong?
     
  2. jcsd
  3. May 23, 2017 #2

    Borek

    User Avatar

    Staff: Mentor

    You need to calculate mass of the solvent at some point, don't you?
     
  4. May 23, 2017 #3
    Yes, true. A bit more....
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: A problem in volumetric calculations in Chemistry
Loading...