First slide

Ionic product of water

Question

The H⁺ ion concentration of a solution is 4×10^–5 M. Then the OH^– ion concentration of the same solution is

Moderate

A

4 x10^-5
B

2.5 x 10^-9
C

1.0 x 10^-7
D

2.5 x 10^-10

Solution

Ionic product of water = K_W
$\Rightarrow [H^{+}] [{OH}^{-}] = 10^{- 14} \Rightarrow 4 \times 10^{- 5} [{OH}^{-}] = 10^{- 14} \Rightarrow [{OH}^{-}] = 2.5 \times 10^{- 10} M$

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