Diapositive PPT
K1 = [AH-] [H3O+] / [AH2]
K2 = [A2-] [H3O+] / [AH-]
[AH2] = [AH-] [H3O+] / K1
[A2-] = K2 [AH-] / [H3O+]
K2 [AH-] / h + Ke / h = [AH-] h / K1
AH- reste néanmoins dans la plupart des cas très largement majoritaire et on peut donc poser [AH-] = C
K2 C / h + Ke / h = C h / K1
2 log h = log { K1K2 + (K1Ke / C) }
pH = -1/2 log { K1K2 + (K1Ke / C) }