In a solvent 50 % of an acid HA dimerizes and the rest dissociates. The van't Hoff factor of the acid is _____ × 10 - 2 (Round off to the nearest integer)

Step-by-step solution

Let initial moles of HA is a 2 HA → H 2   A 2 0 . 5 a               0 . 25 a   HA ⇌ H + +     A - 0 . 5 a       0 . 5 a       0 . 5 a Now, i =  final moles   initial moles  = 0 . 25 a + 0 . 5 a + 0 . 5 a 0 . 5 a + 0 . 5 a = 1 . 25 = 125 × 10 - 2