bases - • weak base partially dissociates o Kb...

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definition  - increases the concentration of OH- ions when dissolved in water   Bronsted-Lowry definition - accepts proton from another substance o even applies to substances not dissolved in water Lewis definition - electron-pair donor pOH = -log [OH-] o pOH = 14 - pH strong base - completely dissociates, [OH-] = [base] o hydroxides of alkali metals and heavy alkaline earth metals
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Unformatted text preview: • weak base- partially dissociates o Kb = [OH-][conjugate acid] / [base] o [OH-] = [conjugate acid] when Kb is very small Find the pH of 0.0030 M solution of ammonia • Kb = 1.8 x 10-5 • Kb = [OH-] [ammonium] / [ammonia] = x2 / 0.0030 • x = [(1.8 x 10-5) (0.0030)]1/2 = 2.3 x 10-4 = [OH-] • pOH = -log [OH-] = 3.63 • pH = 14 - 3.63 = 10.37...
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