The ionization constant of weak acid H_3PO_4 in three step are respectively K_a(1), K_a(2) and K_a (3). Give increasing order of these constant. Give reason.

The ionization constant of weak acid H_3PO_4 in three step are respect

1.	The ionization constant of weak acid H_3PO_4 in three step are respectively K_a(1), K_a(2) and K_a (3). Give increasing order of these constant. Give reason.
Answer» SOLUTION :`K_a(3) lt K_a(2) lt K_a(1)` It is EASIER to form conjugate base by REMOVAL of proton from neutral atom therefore `K_a (1)` is maximum. As, negative charge of conjugate base is more the removal of positively charge proton from it is difficult. As a RESULT negative charge increase then `K_a`, decreases VALUE of `K_a(1) to K_a(2) to K_a(3)` decreases .