Question

If the freezing point of a 0.01 molal aqueous solution of a cobalt(III) chloride-ammonia complex (which behaves as a strong electrolyte) is –0.0558°C, the number of chloride(s) in the coordination sphere of the complex is [K_f of water = 1.86 K kg mol^–1]

Answer 1

Given complex behaves as a strong electrolyte

a =100%
n = 3 (no. of particles given by complex

complex is [Co(NH₃)₅CI]CI₂

no. of Cl^– ions in the co-ordination sphere of the complex = 1