Weak Acids – dissociate incompletely (~20%)               

Strong Acids – dissociate completely (~100%)

A_(g)  +  2 B_(g)                 3 C_(g)  +  D_(g)

Equilibrium constant (K_eq)    =                        K_eq =      LeChatelier’s

                                                                                                                            (lu-SHAT-el-YAY’s)

Example Problems:  Pg 521 (black book) & pg 519 (transparency)

IONIZATION  CONSTANTS  for  ACIDS

  HC₂H₃O_{2( aq)}              H⁺_(aq)  +  C₂H₃O₂^1-_(aq)

 (Please note, in all examples I incorrectly typed C₂H₅O₂^1- instead of C₂H₃O₂^1-)

Equilibrium constant       K_eq =   =  K_a  =  Acid dissociation constant

K_a  =  1.8 x 10^-5  @ 25 ^oC

K_a  = 

 1.8 x 10^-5   = 

                                           K_a

            HCl             H⁺  +  Cl^1-                             very large

        HNO₃              H⁺  +  NO₃^1-                        very large

        H₂SO₄             H⁺  +  HSO₄^1-                        large

        HC₂H₃O₂                H⁺  +  C₂H₃O₂^1-         1.8 x 10^-5  

        H₂S                  H⁺  +  HS^1-                         9.5 x 10^-8   

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