CH301 - Type1.conjACID

CH301 - Type1.conjACID - TYPE 1(conj ACID of a weak base...

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TYPE 1 (conj. ACID of a weak base) ( only the SALT of a weak base is put in solution ) For a salt, BHX, of the weak base (B) in water: BHX (s) + H 2 O BH + + X - (100% ionization!!!, and X - is some anion of a strong acid - it does nothing) Note that BH + behaves EXACTLY like a weak acid in water (a Type 1 problem for acids) and the equilibria is BH + + H 2 O H 3 O + + B —or— BH + H + + B K a + HB BH = + [] [ ] member K a for BH + must be calculated from K b for B: K K K a w b = Now let C BH+ be the analytical concentration (label) of the conjugate acid, BH + : Our Equilibrium "Chart" [BH + ][ H + ] [B] initial C BH+ 00 change -x +x +x final C BH+ - xX x K x x a 2 BH C + = - (29 Equation 3.1 KC K x x a BH a + -= () 2 0 2 =+ - xK aa BH C + [][ ] 4C aaa BH + + == = -+ + x KKK 2 2 This equation is the exact solution for calculating the [H + ] for any solution made by mixing a concentration of ONLY a conjugate weak acid, BH
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This note was uploaded on 11/02/2008 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas.

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CH301 - Type1.conjACID - TYPE 1(conj ACID of a weak base...

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