Two cobalt coordination compounds with the same empirical formula, Co(NH3)5(NO3)2SO4, form solutions with different pH levels when dissolved in water. One remains neutral while the other is basic, representing structural isomerism. The square planar complex ion [PtCl2(NH3)2]2+ exhibits geometric isomerism, with one isomer polar due to opposite charges and the other nonpolar with like charges adjacent.

1. Explain the following experimental observations:
a) Two coordination compounds with the same empirical formula, Co(NH3)5(NO3)2SO4, are
each added to water to make 0.1 M solutions. One solution remains neutral but the other
becomes basic. Give the formula for each compound and name the type of isomerism
represented by these two compounds.
b) The complex ion [PtCl2(NH3)2]2+ is square planar and has two different isomers. One of the
compounds is polar and the other is nonpolar. Draw the compounds and determine which
compound is polar.
Solution
b)[PtCl2(NH3)2]2+
When both the Cl's are opposite to each other or both NH3's are opositopto each other-non
polar
Other wise when Cl is opposite to NH3 it is polar