First slide

Ionic product of water

Question

At some high temperature, K_w of water is 10^–13. Then the pH of the water at the same temperature is

Moderate

A

7.0
B

6.5
C

7.5
D

7.23

Solution

$[H^{+}] = \sqrt{K_{w}} = \sqrt{10^{- 13}} = 10^{- 6.5}$
P^H = 6.5

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