Chapter 20, Problem 30E

Interpretation Introduction

Interpretation: It is given that, when an aqueous solution of $\text{KCN}$ is added to a solution containing ${\text{Ni}}^{2+}$ ions, a precipitate forms, which redissolves on addition of more $\text{KCN}$ solution. The reactions to explain these observations are to be stated.

Concept introduction: An ion or molecule that leads to the formation of coordination complex due to binding with central atom is known as ligand.

To determine: The reactions and to explain the given observations.