   Chapter 2, Problem 54PS

Chapter
Section
Textbook Problem

Write the formulas for the four ionic compounds that can be made by combining the cations Mg2+ and Fe3+ with the anions PO43– and NO3–. Name each compound formed.

Interpretation Introduction

Interpretation:

The names of ionic compounds formed by cations Mg2+ and Fe3+ with the given anions PO43 and NO3 are needed to be determined.

Concept introduction:

Ionic compounds are formed by electrostatic attraction between ions such as mono atomic ions and polyatomic ions; in which positively charged ions is known as cations and negatively charged ions are known as anions.

The sum of charges of ions present in an ionic compound is equals to net charge of the compound. The net charge of the ionic compound must be zero, because it should be balanced.

Naming of ions:

Positive ions (cations) are named as metal name plus cation, example: aluminum cation.

But, for the transition metals the ionic charge also included by roman numerals with the naming of compound. The polyatomic cation NH4+ is named as ammonium cation.

Negative ions (anions) are named by adding ‘ide’ to the stem of the nonmetal element from which the anion is formed, example: chloride, bromide, etc. in case of poly anions, the oxoanions series is named by checking the number of oxygen atom is present in it. If the oxoanion is having greater number of oxygen, then suffix will be ‘ate’. If the number of oxygen atom is less, then the suffix will be ‘ite’. And if the oxoanio is having more than elements, then prefix will be added as ‘per’ with suffix ‘ate’ ions and ‘hypo’ with suffix ‘ite’ of the oxoanions.

Explanation

Ionic compounds are formed by electrostatic attraction between ions such as monoatomic ions and polyatomic ions; in which positively charged ions is known as cations and negatively charged ions are known as anions.

Therefore,

Mg2+ with PO43 and NO3 forms ionic compounds.

The sum of charges of ions present in an ionic compound is equals to net charge of the compound. The net charge of the ionic compound must be zero, because it should be balanced.

So, three Mg2+ ions are required to balance charges of two PO43, and one Mg2+ enough to balance two NO3 ions.

Hence,

The ionic compound formed by Mg2+ with anions PO43 and NO3 are Mg3(PO4)2 and Mg(NO3)2

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