Question

A complex compound is represented as CoCl₃ .xNH₃ . Its 0.1 M solution in water shows depression in freezing point equal to 0.558 K. Assuming 100% ionisation of complex and coordination number of Co to be six, calculate the value of '3x'. K_f for H₂O is 1.86 K kg mol^-1

Answer 1

ΔT_f = i K_f m

i = 1 + (n - 1) α

0.558 = i × 1.86 × 0.1

3 = 1 + (n - 1).1 

i = 3 n = 3 

[Co(NH₃)₅Cl].Cl₂

 x = 5