弱碱的离解常数称为碱度常数 A+H2O=HA+OH Kbdl-0)= CHAOOH- a = [HAJOH 1=K) Y [A] OH- KaKo=andoH-=Kw=1.0x10-14 (25℃) K为水的活度积(热力学常数,只与温度有关) 弱碱的离解常数称为碱度常数 A- + H 2O = HA + OH- − − = = A HA OH b ( 0 ) a a a K I − − − = − = = OH A b ( ) b ( 0 ) [ A ] [HA][OH ] γ γ K I K I 14 H OH W 0 b 0 a 1.0 10 − K K = a + a − = K = × K W为水的活度积(热力学常数,只与温度有关) (25 o C )