   Chapter 3, Problem 80GQ

Chapter
Section
Textbook Problem

(a) Name and give formulas for two water-soluble compounds containing the Cu2+ion. Name two water-insoluble compounds containing the Cu2+ ion.(b) Name and give formulas for two water-soluble compounds containing the Ba2+ ion. Name two water-insoluble compounds containing the Ba2+ ion.

(a)

Interpretation Introduction

Interpretation:

The formula for two water soluble and water insoluble compounds that containing Cu2+ has to be identified.

Concept introduction:

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 (Ag+, Hg22+, Pb2+) are 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 water soluble Cu2+ salts are Copper(II) sulfate (CuSO4) and Copper(II) chloride

(CuCl2) and water insoluble Cu2+ salts are Copper(II) phosphate (Cu3(PO4)2) and Copper(II) oxide (CuO).  Because, Salts of sulfate (SO42-) are soluble, almost all the salts of Cl-, Br-, I-(halides) are soluble

(b)

Interpretation Introduction

Interpretation:

The formula for two water soluble and water insoluble compounds that containing Cu2+ has to be identified.

Concept introduction:

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 (Ag+, Hg22+, Pb2+) are 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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