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

Dec 13, 2016

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

#### Explanation:

$2 {H}_{2} O r i g h t \le f t h a r p \infty n s {H}_{3} {O}^{+} + H {O}^{-}$

At $298 \cdot K$, 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