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Why is Kw value typically used at 25 degrees C

Posted: Fri Dec 01, 2017 12:37 pm
by peytonruiz 1H
Why is it standard to use the value for Kw at 25 degrees C?

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

Posted: Fri Dec 01, 2017 2:45 pm
by Maeve Gallagher 1J
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.

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

Posted: Sun Dec 03, 2017 3:30 pm
by Yizhou Liu 3L
Because 25 degrees C is the room temperature. If the temperature increase, the Kw will increase as well.

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

Posted: Sun Dec 03, 2017 4:59 pm
by Wayland Leung
Does only changing the temperature affect the Kw value? Does anything else affect the Kw value?

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

Posted: Sun Dec 03, 2017 6:05 pm
by Dylan Davisson 2B
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.

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

Posted: Tue Dec 05, 2017 1:58 pm
by diangelosoriano
Will we be expected to be able to calculate at different temperatures for the final?

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

Posted: Tue Dec 05, 2017 3:28 pm
by Chem_Mod
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.