Diapositive PPT
Calcul des concentrations de chaque espèce en fonction du pH
pH = pKa1 + log { [AH-] / [AH2] } = pKa1 + log R1
pH = pKa2 + log { [A2-] / [AH-] } = pKa2 + log R2
[AH-] / [AH2] = R1 = 10( pH - pKa1)
[A2-] / [AH-] = R2 = 10( pH - pKa2)
[A2-] = R2 [AH-] = R1 R2 [AH2]
[AH2] + R1 [AH2] + R1R2 [AH2] = C
[AH2] = C / ( 1 + R1 + R1R2 )