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: Which one has a greater concentration, 1 molar NaOH or 1 molal NaOH aqueous solution?

  1. May 19, 2008 #1

    xec

    User Avatar

    Which one has a greater concentration, 1 molar NaOH or 1 molal NaOH aqueous solution?
    for the answer Explain Why!
     
    xec, May 19, 2008
  2. jcsd
    Phys.org - latest science and technology news stories on Phys.org
  3. May 19, 2008 #2

    symbolipoint

    User Avatar
    Homework Helper
    Education Advisor
    Gold Member

    The question needs some clarity. Do you need emphasis on moles or on mass of the solute? Once you establish this, next you must make reference based on comparable concentration units.
     
    symbolipoint, May 19, 2008
  4. May 20, 2008 #3

    Borek

    User Avatar

    Staff: Mentor

    Calculate molality of 1M NaOH and molarity of 1m NaOH, everything should be clear then.

    Note that you will need solution density for conversion. This has to be taken from density tables.

    Symbolipoint is right in general, but wrong in this particular case :wink: Besides, looks to me like in practice it always works the same.
     
    Borek, May 20, 2008
  5. May 20, 2008 #4

    symbolipoint

    User Avatar
    Homework Helper
    Education Advisor
    Gold Member

    I forgot to account properly for the fact that the same solute (NaOH) is used in both liquids.

    Borek commented:
     
    symbolipoint, May 20, 2008
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook