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0.1 molal aqueous solution of sodium bro...

0.1 molal aqueous solution of sodium bromide freezes at `-0.335^(@)C` at atmospheric pressure. `K_(f)` for water is `1.86^(@)C.` The percentage of dissociation of the salt in solution is

A

90

B

80

C

58

D

98

Text Solution

Verified by Experts

The correct Answer is:
B
`Delta T_(f) = i K_(f) m or 0.335 = i xx 1.86 xx 0.1 or i= 1.80 `
`alpha = (i-1)/(n-1) = (i-1)/(2-1)` For NaBr `i = 1 + alpha or alpha = 0.80 = 80%`
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