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Question: For the following equilibrium NH<sub>3</sub> + H<sub>2</sub>O \(\rightleftharpoons\) \(NH_{4}^{+} +...

For the following equilibrium

NH3 + H2O ⇌\rightleftharpoons NH4++OH−NH_{4}^{+} + OH^{-}calculate the equilibrium constant, if for the equilibrium,

NH4++H2ONH_{4}^{+} + H_{2}O ⇌\rightleftharpoons NH4OH + H+

the equilibrium constant is 5.5 × 10–10

A

1.8 × 10–4

B

1.8 × 10–5

C

1.8 × 10–6

D

1.8 × 10–7

Answer

1.8 × 10–6

Explanation

Solution

For the salt of weak acid and strong base

pH = 12\frac{1}{2} [pKw + pKa – log C]