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)

Question

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),

MARKS App · Accepted Answer

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

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