   Chapter 16, Problem 62E

Chapter
Section
Textbook Problem

# Write equations for the stepwise formation of each of the following complex ions.a. CoF63−b. Zn(NH3)42+

Interpretation Introduction

Interpretation: The equation for the stepwise formation of each CoF63 and Zn(NH3)42+ complex ion is to be stated.

Concept introduction: The charged species that contains metal ion surrounded by ligands is known as complex ion.

The stepwise formation constants explain the formation of complex ion product from its central atom.

Explanation

To determine: The equation for the stepwise formation of each CoF63 and Zn(NH3)42+ complex ion.

The equation for the stepwise formation of CoF63 is,

Co3++6FCo(F)63

Ligands are added by metal ions one by one, in steps that are characterized by equilibrium constants known as formation constants. These are also known as stability constant.

The complex ion CoF63 is formed by the combination of Co3+ and F . In this solution all the species Co3+,F,CoF2+,Co(F)2+,Co(F)3,Co(F)4,Co(F)52 and Co(F)63 exists at equilibrium.

The equations for the stepwise formation of CoF63 are,

Co3++FCoF2+CoF2++FCo(F)2+Co(F)2++FCo(F)3

Co(F)3+FCo(F)4Co(F)4+FCo(F)52Co(F)52+FCo(F)63

Add these equations and cancel the like terms to get the resultant equation,

Co3++6FCo(F)63

The equation for the stepwise formation of

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