   Chapter 4, Problem 46PS

Chapter
Section
Textbook Problem

Identify the ions that exist in each aqueous solution, and specify the concentration of each ion.(a) 0.12 M BaCl2(b) 0.0125 M CuSO4(c) 0.500 M K2Cr2O7

(a)

Interpretation Introduction

Interpretation:

The ions exist in aqueous solution of 0.12 M BaCl2 and concentration of each ion has to be determined.

Concept introduction:

• Concentration of solutions can be expressed in various terms; molarity is one such concentration expressing term.
• Molarity (M) of a solution is the number of gram moles of a solute present in one liter of the solution.

Molarity=NumberofmolesofelementVolumeofsolutioninlitres

• A solution containing one gram mole or 0.1 gram of solute per litre of solution is called molar solution.
• Amount of substance (mol) can be determined by using the equation,

Numberofmole=GivenmassofthesubstanceMolarmass

• The molar mass of an element or compound is the mass in grams of 1 mole of that substance, and it is expressed in the unit of grams per mol (g/mol).
• For chemical reaction balanced chemical reaction equation written in accordance with the Law of conservation of mass.
• Law of conservation of mass states that for a reaction total mass of the reactant and product must be equal.
Explanation

One mole of BaCl2 compound dissociates into one mole of Ba2+ and 2molofCl- ions in solution.

BaCl2Ba2++2Cl-

So the ions that exist in 0.12MBaCl2 aqueous solution are Ba2+ and Cl-

Molar concentration of barium ion [Ba2+]= 1×0

(b)

Interpretation Introduction

Interpretation:

The ions exist in aqueous solution of 0.0125 M CuSO4 and concentration of each ion has to be determined.

Concept introduction:

• Concentration of solutions can be expressed in various terms; molarity is one such concentration expressing term.
• Molarity (M) of a solution is the number of gram moles of a solute present in one liter of the solution.

Molarity=NumberofmolesofelementVolumeofsolutioninlitres

• A solution containing one gram mole or 0.1 gram of solute per litre of solution is called molar solution.
• Amount of substance (mol) can be determined by using the equation,

Numberofmole=GivenmassofthesubstanceMolarmass

• The molar mass of an element or compound is the mass in grams of 1 mole of that substance, and it is expressed in the unit of grams per mol (g/mol).
• For chemical reaction balanced chemical reaction equation written in accordance with the Law of conservation of mass.
• Law of conservation of mass states that for a reaction total mass of the reactant and product must be equal.

(c)

Interpretation Introduction

Interpretation:

The ions exist in aqueous solution of 0.500 M K2Cr2O7 and concentration of each ion has to be determined.

Concept introduction:

• Concentration of solutions can be expressed in various terms; molarity is one such concentration expressing term.
• Molarity (M) of a solution is the number of gram moles of a solute present in one liter of the solution.

Molarity=NumberofmolesofelementVolumeofsolutioninlitres

• A solution containing one gram mole or 0.1 gram of solute per litre of solution is called molar solution.
• Amount of substance (mol) can be determined by using the equation,

Numberofmole=GivenmassofthesubstanceMolarmass

• The molar mass of an element or compound is the mass in grams of 1 mole of that substance, and it is expressed in the unit of grams per mol (g/mol).
• For chemical reaction balanced chemical reaction equation written in accordance with the Law of conservation of mass.
• Law of conservation of mass states that for a reaction total mass of the reactant and product must be equal.

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