   # Some ionic compounds contain a mixture of different charged cations. For example, wüstite is an oxide that contains both Fe 2+ and Fe 3+ cations and has a formula of Fe 0.950 O 1.00 .Calculate the fraction of iron ions present as Fe 3+ . What fraction of the sites normally occupied by Fe 2+ must be vacant in this solid? ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

#### Solutions

Chapter
Section ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 9, Problem 138CP
Textbook Problem
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## Some ionic compounds contain a mixture of different charged cations. For example, wüstite is an oxide that contains both Fe2+ and Fe3+ cations and has a formula of Fe0.950O1.00.Calculate the fraction of iron ions present as Fe3+. What fraction of the sites normally occupied by Fe2+ must be vacant in this solid?

Interpretation Introduction

Interpretation:

• The fraction of Iron ions present as Fe3+ in Wustite has to be determined.
• The fraction of the vacant Fe2+ sites in the compound has to be determined.

Concept introduction:

A compound containing mixture of ions of same element having different charges in an uneven ratio is called non-stoichiometric compound. Most of such compounds are Inorganic compounds. Transition metal elements form wide range of non-stoichiometric compounds. The variable oxidation states of the metal ions are responsible for the formation of such compounds.

### Explanation of Solution

Explanation

Calculate the fraction of Iron ions present as Fe3+ in Wustite.

Known data: Empirical formula of Wustite is Fe0.950O1.00. It contains both Fe2+andFe3+   ions.

Let 'x' be the fraction of Fe2+ionsand'y' bethefractionofFe3+ions.then,x+y=0.950......(1)balancingthecharges,2x+3y=2.000......(2)Rewriting(1),y=0.950-x......(3)

substitute(3)in(2),2x+3(0

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