Question

Like all equilibrium constants, the value of kw depends on temperature. at body temperature (37∘c), kw=2.4⋅10−14. part a what is the [h3o+] in pure water at body temperature?

Answer 1

First, we have to know that we can put [H+] instead of [H3O+]

so, according to the reaction equation:

by using ICE table:

             H2O ↔  H+  +  OH-

initial                    0           0

change                +X         +X

Equ                       X             X

when Kw = [H+] [OH-]

and when we have Kw = 2.4 x 10^-14 

and when [H+] = [OH-] = X

∴ 2.4 x 10^-14 = X^2

∴ X = √(2.4 x 10^-14)

      = 1.55 x 10^-7

∴[H+] = 1.55 x 10^-7