The degree of dissociation of pure water at 25°C is found to be 1.8 × 10–9. The dissociation constan

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The degree of dissociation of pure water at 25°C is found to be 1.8 × 10–9. The dissociation constant, Kd of water, at 25°C is

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$K_{d} = \frac{\left\lbrack H^{+} ightbrack\left\lbrack OH^{-} ightbrack}{\left\lbrack H_{2}O ightbrack}$$= \frac{\alpha^{2}.C}{1 - \alpha} \approx \alpha^{2}.C = \left( 1.8 	imes 10^{- 9} ight)^{2} 	imes \frac{1000}{18} = 1.8 	imes 10^{- 16}$

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