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Dilution of NaOH

  1. Sep 9, 2008 #1
    Hello

    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?

    Thanks
     
  2. jcsd
  3. Sep 9, 2008 #2

    Borek

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    Staff: Mentor

    Dilution heats are tabelarized.
     
  4. Sep 10, 2008 #3
    That's right.

    I found this nice table: http://www.pioneercompanies.com/customers/tech/data/naoh/ENTHALPY.pdf [Broken]

    You just draw a line between your solutions and you can see the final temperature.
     
    Last edited by a moderator: Apr 23, 2017 at 3:35 PM
  5. Sep 10, 2008 #4

    GCT

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    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%20OF%20SODIUM%20HYDROXIDE%20SOLUTIONS.pdf [Broken]

    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 by a moderator: Apr 23, 2017 at 3:37 PM
  7. Sep 11, 2008 #6

    GCT

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    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.
     
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