Diapositive PPT
E.N : [H3O+] + [Na+] = [OH-] + [A-]
C.M. 1 : [AH] + [A-] = Ca + Cb
C.M. 1 : { [A-] h / Ka } + [A-] = Ca + Cb
[A-] = {Ca + Cb} / ( 1 + h / Ka ) = M { Ca + Cb }
h + Cb = (Ke / h) + M { Ca + Cb }
h2 + Cb h = Ke + h M { Ca + Cb }
h2 + Cb h - h M { Ca + Cb } - Ke = 0
h2 + Cb h - h M {Ca + Cb} - Ke = 0
On pose comme d’habitude L = 1 + h / Ka et M = 1 / L