   Chapter 2.5, Problem 2.5CYU

Chapter
Section
Textbook Problem

(a) Write the formulas of all neutral ionic compounds that can be formed by combining the cations Na+ and Ba2+ with the anions S2– and PO43–. (b) Iron forms ions having 2+ and 3+ changes. Write the formulas of the compounds formed between chloride ions and these two different iron cations.

(a)

Interpretation Introduction

Interpretation:

The all neutral ionic compounds formed by the cations Na+ and Ba2+ with anions S2 and PO43 are need to be determined.

Concept introduction:

• 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.
• 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.
• General oxidation state of group IA metals is +1.
• General oxidation state of group IIA metals is +2.
• The charge of sulfide, phosphate and chloride ions are 2, 3 and 1 respectively.
Explanation

The charge of Na+ is +1

The charge of polyatomic ions sulfide and phosphate are 2 and 3 respectively.

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,

Na+ forms ionic compounds with S2 and PO43 ions.

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, two Na+ ions are required to balance 2 charge of S2 and the charges of one PO43 ions are balanced by three Na+ ions.

Hence,

The ionic compound formed by Na+ with S2 and PO43 ions are Na2SandNa3PO4 respectively.

The charge of Ba2+ is +2

The charge of polyatomic ions sulfide and phosphate are 2 and 3 respectively

(b)

Interpretation Introduction

Interpretation:

The formulas of compound formed between chloride ions and different iron cations has to be written.

Concept introduction:

• 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.
• 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.
• General oxidation state of group IA metals is +1.
• General oxidation state of group IIA metals is +2.
• The charge of sulfide, phosphate and chloride ions are 2, 3 and 1 respectively.

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