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Topic: Crystallization of Caustic solution  (Read 8596 times)

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Offline stevenjporteous

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Crystallization of Caustic solution
« on: November 13, 2008, 11:26:37 AM »
Have searched the internet for information about the crystallization of caustic to no avail. Could someone tell me what temperature sodium hydroxide (caustic) at 3.4% strength would crystalize?

Help please...

Offline jansenwrasse

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Re: Crystallization of Caustic solution
« Reply #1 on: November 14, 2008, 08:16:54 PM »
Are you refering to its new freezing point?

Offline jansenwrasse

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Re: Crystallization of Caustic solution
« Reply #2 on: November 14, 2008, 09:18:06 PM »
I just realized you were not online ::)

 :delta:Tf = (i)(kb)(m)

so you will need to van't Hoff factor(i) for NaOH ( i = 2)

so ...

:delta:Tf = 2 x 1.86oC x .85M = 3.162 oC

Offline jansenwrasse

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Re: Crystallization of Caustic solution
« Reply #3 on: November 16, 2008, 09:03:32 AM »
There is an error in my equation I used the molarity for the calculation and the correct form is molality.  Converty your 2.3% to molality then the rest is correct.  Sorry about that  ::)

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