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CH301 - Type1.conjBASE

CH301 - Type1.conjBASE - TYPE 1(conj BASE of weak acid only...

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TYPE 1 (conj. BASE of weak acid) ( only the SALT of a weak acid put in solution ) For a salt of a weak acid (NaA) in water: STEP 1: NaA (s) + H 2 O Na + + A - (100% ionization!!!) STEP 2: A - + H 2 O HA + OH - Note that A - behaves EXACTLY like a weak base in water (a Type 1 problem for bases) and the equilibria is K b - OH HA A = - [ ][ ] [ ] and remember K b for A - must be calculated from K a for HA: K K K b w a = Now let C A- be the analytical concentration (label) of the conjugate base, A - : Our Equilibrium "Chart" [A - ] [OH - ] [HA] initial C A- 0 0 change -x +x +x final C A- - x x x K x x b 2 A C - = - ( 29 Equation 3.1 K C K x x b A b - - = ( ) 2 0 2 = + - x K x K b b A C - ( ) [ ] [ ] OH A 4 C b b b A - - - = = = - + + x K K K 2 2 This equation is the exact solution for calculating the [OH - ] for any solution made by mixing a concentration of
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