Question

For a very dilute aqueous solution of $H_{3}P{O}_3$ van't Hoff factor

• A. i = 7
• B. i = 3
• C. i = 4
• D. i = 5

Answer 1

Answer: (B)

$H_{3}P{O}_3$ ionises in water as
$H_{3}P{O}_3\rightleftharpoons 2H^{+}+HP{O}_3^{2-}$
$\therefore i=3$