Solutions Question 361
Question: 1.0 M aqueous solution of $ CrCl_3.6H_2O $ freezes at $ -5.58{}^\circ C $ . Assuming complete ionization of the hydrated complex, which of the following isomers conforms to the observation ( $ K_{f} $ for water $ =1.86K,kg,mo{l^{-1}} $ )-
Options:
A) $ [Cr{{( H_2O )}_3}Cl_3].3H_2O $
B) $ [Cr{{( H_2O )}_4}Cl_4]Cl.2H_2O $
C) $ [Cr{{( H_2O )}_5}Cl]Cl_2.H_2O $
D) $ [Cr{{( H_2O )}_6}]Cl_3 $
Show Answer
Answer:
Correct Answer: C
Solution:
$ i=\frac{5.58}{1.86}=3; $
$ [ Cr{{( H_2O )}_5}Cl ]Cl_2.H_2O\xrightarrow{{}} $ $ {{[Cr{{(H_2O)}_5}Cl]}^{2+}}+2C{l^{-}} $
