Why is Kw value typically used at 25 degrees C  [ENDORSED]

Acidity
Basicity
The Conjugate Seesaw

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peytonruiz 1H
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Why is Kw value typically used at 25 degrees C

Postby peytonruiz 1H » Fri Dec 01, 2017 12:37 pm

Why is it standard to use the value for Kw at 25 degrees C?

Maeve Gallagher 1J
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Re: Why is Kw value typically used at 25 degrees C

Postby Maeve Gallagher 1J » Fri Dec 01, 2017 2:45 pm

25 degrees Celsius is the standard room temperature value used for most equations and calculations in chemistry. It is just used to show that its not super hot or super cold.

Yizhou Liu 3L
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Re: Why is Kw value typically used at 25 degrees C

Postby Yizhou Liu 3L » Sun Dec 03, 2017 3:30 pm

Because 25 degrees C is the room temperature. If the temperature increase, the Kw will increase as well.

Wayland Leung
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Re: Why is Kw value typically used at 25 degrees C

Postby Wayland Leung » Sun Dec 03, 2017 4:59 pm

Does only changing the temperature affect the Kw value? Does anything else affect the Kw value?

Dylan Davisson 2B
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Re: Why is Kw value typically used at 25 degrees C

Postby Dylan Davisson 2B » Sun Dec 03, 2017 6:05 pm

Because kW is the equilibrium constant, it only changes with temperature. This is because the dissociation of water molecules is an endothermic process, a process that is affected by temperature. The higher the temperature, the further the equilibrium moves to the right, which affects the kW value.

diangelosoriano
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Re: Why is Kw value typically used at 25 degrees C

Postby diangelosoriano » Tue Dec 05, 2017 1:58 pm

Will we be expected to be able to calculate at different temperatures for the final?

Chem_Mod
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Re: Why is Kw value typically used at 25 degrees C  [ENDORSED]

Postby Chem_Mod » Tue Dec 05, 2017 3:28 pm

diangelosoriano wrote:Will we be expected to be able to calculate at different temperatures for the final?


Chem 14A, no.

I will cover this in Chem 14B when we do thermodynamics.


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