Ionisation constant of water

[sajib_mostofa]

Am I correct in saying that since the self ionisation of water is endothermic, an increase in temperature would shift equilibirum to the left, hence the ph decreases but water still remains NEUTRAL?

Also, what happens to the value of KA as temperature is increased?

[akira88]

An increase in temperature will shift the equilibrium system to the RIGHT, not the left. pH decreases however is still neutral as [OH-] = [H30+].
For water, the KA value will increase when the temperature is increased.

[sajib_mostofa]

An increase in temperature will shift the equilibrium system to the RIGHT, not the left. pH decreases however is still neutral as [OH-] = [H30+].
For water, the KA value will increase when the temperature is increased.

oops my mistake i meant right. Thanks for confirming that. A higher KA means a lower pH?

[jasoN-]

Ka or Kw?, a higher Kw means more H3O+ and hence a lower pH (as pH measures acidity not basicity).

I guess a higher Ka will mean the same thing, but I don't think Ka will be related with water reacting with water.

[sajib_mostofa]

Ka or Kw?, a higher Kw means more H3O+ and hence a lower pH (as pH measures acidity not basicity).

I guess a higher Ka will mean the same thing, but I don't think Ka will be related with water reacting with water.

Haha I was just talking bout Ka and Kw separately. Thanks for clarifiying that