   Chapter 22.7, Problem 3.3ACP

Chapter
Section
Textbook Problem

The compound (NH4)2Ce(NO3)6 is a widely used oxidizing agent in redox titrations. A 0.181 g sample of pure iron is dissolved in acid, reduced to Fe2+, and then titrated with 31.33 mL of (NH4)2Ce(NO3)6 (to give Ce3+ and Fe3+). Calculate the concentration of the cerium salt.

Interpretation Introduction

Interpretation:

Concentration cerium salt in the in the given compound has to be calculated..

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=MassperlitreMolecular mass

• 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).
• Concentrationofsubstance=Amountof substancevolumeofthesubstance
• 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

Probable equation for the given reaction can be written as follows,

Fe(aq)2++[Ce(NO3)6](aq)2Fe(aq)3++Ce(aq)3++6NO3(aq)

Given mass of Feis0.181g which is dissolved in acid, reduced to Fe2+ and then titrated with 31.33mLof(NH4)2Ce(NO3)6

Amount of Fe2+ (in mol) can be calculated as follows,

0.181gFe×1molofFe55.85gFe=0

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