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 dis
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
9 views
1 Answers
Correct Answer - 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%`
9 views
Answered