How would we expect the autoprotolysis reaction of water.... #2H_2O(l) rightleftharpoons H_3O^+ + HO^-# .... to evolve with increasing temperature?

2 Answers
Dec 13, 2016

Answer:

Consider the acid base equilibrium in water.......

Explanation:

#2H_2O rightleftharpoons H_3O^+ + HO^-#

At #298*K#, under standard conditions, #K_w=10^-14#. This is well-known.

The equilibrium reaction is clearly a BOND-BREAKING reaction, and given the extent of reaction (as revealed by #K_w#) it is thermodynamically uphill. At higher temperatures, we would thus expect the equilibrium to shift to the right, inasmuch as we are supplying some of the energy to break the strong #O-H# bonds.

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Jan 14, 2017

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