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

[peytonruiz 1H]

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

[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.

[Yizhou Liu 3L]

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

[Wayland Leung]

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

[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.

[diangelosoriano]

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

[Chem_Mod]

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.