   Chapter 3, Problem 97SCQ

Chapter
Section
Textbook Problem

Describe how to prepare BaSO4, barium sulfate, by (a) a precipitation reaction and (b) a gas-forming reaction. The available starting materials are BaCl2, BaCO3, Ba(OH)2, H2SO4, and Na2SO4. Write complete, balanced equations for the reactions chosen. (See page 138 for an illustration of the preparation of the compound.)

(a)

Interpretation Introduction

Interpretation:

Preparation of BaSO4 by precipitation reaction by using given materials and the complete balanced equations for the reaction chosen should be written,

Concept introduction:

Precipitation reaction: The formation of the product is insoluble when the ions combine in the solution is called precipitation reaction.

Acid - base reaction: Formation of the salt from the cation from the base and anion from the acid and formation of water is also the product.

Gas forming reaction: The reaction of acid and metal carbonates which produce carbonic acid. The carbonic acid decomposes which gives water and carbon dioxide.

Oxidation - reduction reaction: The electrons are transferred to one to other is called oxidation reduction reaction.

Explanation

Barium chloride is reaction with Sodium sulfate which gives barium sulfate, which is shown below.

BaCl2(aq)+Na2SO4(aq)BaSO4(s)+NaCl(aq)

Balance the equation,

Balance the sodium atom in the given equation, when balancing the equation, we should not alter the subscripts and we can change coefficients.  There are two sodium atoms in the left side and one sodium atom in the right side.  Therefore two molecule of sodium chloride is added to right side of reaction.  Therefore the balanced equation is given below.

BaCl2(aq)+Na2SO4(aq)BaSO4(s)+2NaCl(aq)

Almost all the salts of Cl-, Br-, I-(halides) are soluble

(b)

Interpretation Introduction

Interpretation:

Preparation of BaSO4 by gas forming reaction by using given materials and the complete balanced equations for the reaction chosen should be written,

Concept introduction:

Precipitation reaction: The formation of the product is insoluble when the ions combine in the solution is called precipitation reaction.

Acid - base reaction: Formation of the salt from the cation from the base and anion from the acid and formation of water is also the product.

Gas forming reaction: The reaction of acid and metal carbonates which produce carbonic acid. The carbonic acid decomposes which gives water and carbon dioxide.

Oxidation - reduction reaction: The electrons are transferred to one to other is called oxidation reduction reaction.

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