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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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BuyFindarrow_forward

Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

Define each of the following terms:

a. coordination compound

b. complex ion

c. counterions

d. coordination number

e. ligand

f. chelate

g. bidentate

How would transition metal ions be classified using the Lewis definition of acids and bases? What must a ligand have to bond to a metal? What do we mean when we say that a bond is a “coordinate covalent bond”?

Interpretation Introduction

Interpretation: The definition of the given terms along with the concept behind the coordination compounds is to be stated.

Concept introduction: The transition metal atoms have a tendency to form complex compounds that are linked to the certain neutral or ionic species and this leads to the formation of coordination compounds. These coordination compounds have a large number of applications in the chemical industry as well as in daily life.

Explanation

(I)

(a)

To determine: The definition of coordination compounds.

The compounds in which a metal ion is surrounded by certain atoms and there is present a coordinate bond between the metal atom and the atoms surrounding it are called coordination compounds.

A coordination complex is basically based on the concept of reaction between a Lewis acid and a Lewis base. There occurs bonding between the neutral molecules or anionic species with the central metal atom, where they donate their electrons to the central metal atom and form a coordination bond. So the presence of coordination complex leads to the formation of coordination compounds.

(b)

To determine: The definition of complex ion.

It is basically a charged species and is of two types,

  • Cationic complex species- These are those species that carry a positive charge. For example [Co(SO4)(NH3)5]+ .
  • Anionic complex species- These are those species that carry a negative charge. For example [PtCl4]2 .

(c)

To determine: The definition of counter ions.

When a charged complex is present, then that charge is stabilized by the counter ions that are associated with the complex ion. For example in K3[Fe(CN)6] , K+ acts as the counter ion for [Fe(CN)6]3 .

(d)

To determine: The definition of coordination number.

The coordination number can be from 2 to 16 for the metal atom. It basically depends upon the relative size of the metal atom that how much number of ligands can be attached with it. It also depends on the charge that is present over the metal ion.

(e)

To determine: The definition of ligand

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