CH301 - Type1.conjACID

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

This preview shows pages 1–2. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## 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.

### Page1 / 2

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online