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Author Topic: Reaction NH4OH - NH3Cl  (Read 4993 times)

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mahtrelew

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Reaction NH4OH - NH3Cl
« on: December 02, 2007, 11:47:13 AM »

I've been asked to find the pH of NH4OH 0.1 M and NH3Cl 0.05 M.
I tried these reactions:

NH4OH <==> NH4 + OH   with Kb=1.8 E 5-   (1)

NH3Cl ---> NH3 + Cl

and then

NH3 + H20 <===> NH4 + OH        (2)

then then the concentration of NH4 and the concentration of OH is the  sum of  NH4 and the sum of OH I carry from (1) and the NH4 and OH due to the reaction (2), and the pH will be

pH=14-pOH of reaction (2).

I'll appreciate you to tell me if that's ok.

Thanks a lot.

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Borek

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Re: Reaction NH4OH - NH3Cl
« Reply #1 on: December 02, 2007, 11:57:59 AM »

No such thing as NH3Cl, I suppose you mean NH4Cl?

Do you mean that solution contains both NH3 (or NH4OH, it is the same thing here) and NH4Cl? If so, it is buffer solution.
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mahtrelew

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Re: Reaction NH4OH - NH3Cl
« Reply #2 on: December 02, 2007, 12:02:47 PM »

Reading your answer, I guess there was a mistake either when I copied the problem or when the professor wrote it. I'll check. Thanks a lot for your answer.
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