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CH301 - Type1.base

# CH301 - Type1.base - TYPE 1(base only B is put into...

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TYPE 1 (base) ( only B is put into solution ) For a weak base (B) in water: B + H 2 O OH - + BH + K b = [OH ± ][BH + ] [B] and let C B be the analytical concentration (label) of the weak base Our Equilibrium "ICE" Table [B] [OH - ] [BH + ] initial C B 0 0 change – x + x + x equilibrium C B – x x x K b = x 2 C B ± x ( ) Equation 1.1 K b C B ± K b ( x ) = x 2 0 = x 2 + K b ( x ) ± K b C B [OH ± ] = [BH + ] = x = ± K b + K b 2 + 4 K b C B 2 This equation is the exact solution for calculating the [OH - ] for any solution made by mixing a concentration of ONLY a weak base in water. (What I have designated a "Type 1" problem) If we are using a REASONABLE concentration for B ( somewhere between 1.0 M and 0.05 M) AND
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