   Chapter 3, Problem 61PS

Chapter
Section
Textbook Problem

Classify each of the following reactions as a precipitation, acid-base, or gas forming reaction. Show states for the products (s, ℓ, g aq), and then balance the completed equation. Write the net ionic equation.(a) MnCl2(aq) + Na2S(aq) → MnS + NaCl(b) K2CO3(aq) + ZnCl2(aq) → ZnCO3 + Ka

(a)

Interpretation Introduction

Interpretation:

• The given reaction has to be classified as precipitation or acid-base or gas forming reaction and the product should be shown.
• The completed  reaction should be balanced and net ionic equation for this reaction should be shown.

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.

Most of the ionic compounds are soluble in water, very few of the ionic compounds are sparingly soluble, and some of the ionic compounds are insoluble in water.  When it is soluble in water ions gets separated in the solution.

Soluble compounds in water

Almost all the salts of Na+, K+, NH4+,(NO3-),(ClO3-),(ClO4-)and(CH3CO2-) are soluble.

Almost all the salts of Cl-, Br-, I-(halides) are soluble.  But some of the halides are (Ag+, Hg22+, Pb2+) insoluble.

Salts of F- are soluble.  But some of the fluoride salt of Mg2+, Ca2+, Sr2+, Ba2+, Pb2+ are insoluble.

Salts of sulfate (SO42-) are soluble.  But sulfates of Ca2+, Sr2+, Ba2+, Pb2+, Ag+, are insoluble.

Insoluble compounds in water:

Most of the salts of (CO32-),(PO43-)(C2O42-),(CrO42-)and(S2-) are insoluble but some of the salts of NH4+, alkali metal cations and BaS are soluble.

Most of the metal hydroxides and oxides are insoluble in water bit some of the alkali metal hydroxides, Ba(OH)2and Sr(OH)2 are soluble in water.

Explanation

The state of the reaction, balancing of the reaction and the type of the reaction is shown below, the given reaction is precipitation reaction and the balanced equation is shown below

The given compound is manganese(II) chloride and sodium sulfide which is soluble in water.  In this reaction manganese(II) chloride reaction with sodium sulfide to give Manganese(II) sulfide and sodium chloride.

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...

(b)

Interpretation Introduction

Interpretation:

• The given reaction has to be classified as precipitation or acid-base or gas forming reaction and the product should be shown.
• The completed  reaction should be balanced and net ionic equation for this reaction should be shown.

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.

Most of the ionic compounds are soluble in water, very few of the ionic compounds are sparingly soluble, and some of the ionic compounds are insoluble in water.  When it is soluble in water ions gets separated in the solution.

Soluble compounds in water

Almost all the salts of Na+, K+, NH4+,(NO3-),(ClO3-),(ClO4-)and(CH3CO2-) are soluble.

Almost all the salts of Cl-, Br-, I-(halides) are soluble.  But some of the halides are (Ag+, Hg22+, Pb2+) insoluble.

Salts of F- are soluble.  But some of the fluoride salt of Mg2+, Ca2+, Sr2+, Ba2+, Pb2+ are insoluble.

Salts of sulfate (SO42-) are soluble.  But sulfates of Ca2+, Sr2+, Ba2+, Pb2+, Ag+, are insoluble.

Insoluble compounds in water:

Most of the salts of (CO32-),(PO43-)(C2O42-),(CrO42-)and(S2-) are insoluble but some of the salts of NH4+, alkali metal cations and BaS are soluble.

Most of the metal hydroxides and oxides are insoluble in water bit some of the alkali metal hydroxides, Ba(OH)2and Sr(OH)2 are soluble in water.

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