what is first and second ionisation constant Share with your friends Share 0 Vartika Jain answered this Dear Student, Ionisation constant is the equilibrium constant for the ionisation of acid. Now, in polyprotic acids where more than one H are present there are more than one ionisation constant.For the ionisation of first H, the equilibrium constant is called first ionisation constant and for second H it is called second ionisation constantH2A ↔ HA- + H+ Ka1HA- ↔ A2- + H+ Ka2Here Ka1 and Ka2 are first and second ionisation constant respectively. 1 View Full Answer
