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 interaction of PCl$_3$ with 2KCl forms the complex [PCl$_4$]K. This complex does not precipitate AgCl when treated with AgNO$_3$. This is because the chloride ions present act as counterions and do not react with Ag$^+$. The IUPAC name of this complex is potassium tetrachloridophosphorus(III).