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Self Ionization of water and the Kw constant

Self Ionization of water and the Kw constant. By: Alexa Morency. Self Ionization of Water. A reaction in which a water molecule (H 2 O) loses the nucleus of one of its hydrogen atoms to form a hydroxide ion (OH − )

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Self Ionization of water and the Kw constant

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  1. Self Ionization of water and the Kw constant By: AlexaMorency

  2. Self Ionization of Water • A reaction in which a water molecule (H2O) loses the nucleus of one of its hydrogen atoms to form a hydroxide ion (OH−) • The hydrogen then binds with another water molecule to form hydronium (H3O+) • This can be written as: • H2O (l) + 59kJ -> H + OH OR -2 H2O (l) + 59kJ -> H3O + OH

  3. Kw • Kw is the equilibrium constant for water • It is the ionization constant, dissociation constant, self-ionization constantof water, and is symbolized by Kw and shown here: • And it equals 1.00x10^-14 (At 25C)

  4. Kw cont. • When the temperature is increased, it increases the concentrations of H3O and OH, and has increased electrical conductivity • When the temperature is decreased, the concentrations of H3O and OH decrease, and electrical conductivity also decreases. • Unless told otherwise in a equation, assume Kw= 1.00x10^-14 and that the temperature is at 25C

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