Question

PCl$_3$, 2KCl does not give precipitate of AgCl with AgNO$_3$ solution. Write the structural formula and IUPAC name of the complex.

Hint:

For complexes, always remember to consider the coordination environment and the counterions when writing the structural formula.

Answer 1

The complex formed by the interaction of PCl$_3$ with 2KCl is [PCl$_4$]K. This complex does not give a precipitate of AgCl with AgNO$_3$ because it contains chloride ions as counterions that do not react with Ag$^+$.
The IUPAC name of this complex is tetrachloridophosphorus(III) potassium.