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Topic: Kd and Kw of water ?  (Read 9889 times)

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Offline aeacfm

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Kd and Kw of water ?
« on: June 15, 2010, 10:08:07 AM »
we were disscusing dissociation of materials and i said that Kd of water is different from Kw of it but every body told me that they are the same
is they are the same or different ?
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Offline Borek

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Re: Kd and Kw of water ?
« Reply #1 on: June 15, 2010, 10:36:54 AM »
Write both reactions and both constant definitions.
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Offline aeacfm

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Re: Kd and Kw of water ?
« Reply #2 on: June 15, 2010, 10:42:29 AM »
H2O ::equil::H++OH-
Kd = [H+][OH-]/{H2O]
where Kw = Kd*[H2O]
 isnt that right
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Offline aeacfm

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Re: Kd and Kw of water ?
« Reply #3 on: June 15, 2010, 10:44:23 AM »
take in account that i didnot write the hydration H3O+ as water her as water is general solvent
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Offline Borek

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Re: Kd and Kw of water ?
« Reply #4 on: June 15, 2010, 12:31:09 PM »
In general you are right, just remember that concentration of water is assumed to be constant and as such included in Kw value.

http://www.chembuddy.com/?left=pH-calculation&right=water-ion-product
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Offline aeacfm

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Re: Kd and Kw of water ?
« Reply #5 on: June 16, 2010, 04:54:00 AM »
the concentration of water @ STP i think 55.55 N isnt it ?
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Offline aeacfm

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Re: Kd and Kw of water ?
« Reply #6 on: June 16, 2010, 04:55:57 AM »
so i find the Kd of water is 1.8 x10 -16
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Offline Abdul

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completion of chemical equation.
« Reply #7 on: July 31, 2010, 08:40:28 AM »
Quote from: aeacfm on June 15, 2010, 10:08:07 AM
we were disscusing dissociation of materials and i said that Kd of water is different from Kw of it but every body told me that they are the same
is they are the same or different ?
Logged
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