Question

If the freezing point of a 0.01 molal aqueous solution of a cobalt(III) chloride-ammonia complex (which behaves as a strong electrolytes) is `-0.0558^(@)C`, the number of chloride(s) in the coordination sphere of the complex is [`K_(f)` of water `=1.86 Kkgmol^(-1)`]

Answer 1

Correct Answer - 1
`Delta T_(f)=K_(f)xx ixx m rArr 0.0558=1.86xx ixx0.01`
i=3
Given complex behaves as a strong electrolyte `alpha = 100%`
n = 3(no. of particles given by complex)
`therefore` complex is `[Co(NH_(3))_(5)Cl]Cl_(2)`
no. of `Cl^(-)` ions in the co-ordination sphere of the complex = 1
`Delta T_(f)=K_(f)xx ixx m`
`0.0558=1.86xx ixx0.01`
i = 3