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 of NaOH

  1. Sep 9, 2008 #1

    I know that dissolving pure NaOH in water will generate heat. But what happens when you dilute a 24% NAOH solution with water till 2%?

    Example: What is the DeltaH for 100 ml 24% NaOH solution + 50 ml H2O?

  2. jcsd
  3. Sep 9, 2008 #2


    User Avatar

    Staff: Mentor

    Dilution heats are tabelarized.
  4. Sep 10, 2008 #3
  5. Sep 10, 2008 #4


    User Avatar
    Science Advisor
    Homework Helper

    Last edited: Sep 10, 2008
  6. Sep 11, 2008 #5
    What's wrong with my method? I was asked to calculate the final temperature of the solution.

    Additionally, this is the method described by the company itself:

    http://www.pioneercompanies.com/customers/tech/data/naoh/DILUTION OF SODIUM HYDROXIDE SOLUTIONS.pdf

    What I don't understand is, the two curves aren't the same, or am I not seeing right? There is a flattening of the curve close to 0 % for low temperatures.

    The minima aren't the same either.

    (as for the enthalpy of dilution, I would substract the initial and end enthalpies with each other and that's the answer)
    Last edited: Sep 11, 2008
  7. Sep 11, 2008 #6


    User Avatar
    Science Advisor
    Homework Helper

    Your method is two steps , the actual method consists of three steps and three independent variables for a dilution ; first composition , water , and the desired composition.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Dilution of NaOH
  1. SO2 in NaOH (Replies: 18)

  2. Aspirin + NaOH => ? (Replies: 9)

  3. NaOH(s) -> NaOH(g) (Replies: 4)

  4. NaOH in HCl (Replies: 14)