0.1 molal aqueous solution of N a B r freezes at - 0.335 ℃ at atmospheric pressure, k f for water is 1.86 ℃ . The percentage of dissociation of the salt in solution is

Question

0.1 molal aqueous solution of N a B r freezes at - 0.335 ℃ at atmospheric pressure, k f for water is 1.86 ℃ . The percentage of dissociation of the salt in solution is, 90, 80, 58, 98

MARKS App · Accepted Answer

∆ T f = i k f m 0.335 = i × 1.86 × 0.1 i = 1.80 For N a B r , i = 1 + α α = 0.80 = 80 %

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