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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
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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