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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

To analyze an iron-containing compound, you convert all the iron to Fe2+ in aqueous solution and then titrate the solution with standardized KMnO4. The balanced, net ionic equation is

MnO4(aq) + 5 Fe2(aq) + 8 H3O+(aq) → Mn2(aq) + 5 Fe3+(aq) + 12 H2O(l)

A 0.598-g sample of the iron-containing compound requires 22.25 mL of 0.0123 M KMnO4 for titration to the equivalence point. What is the mass percent of iron in the sample?

Interpretation Introduction

Interpretation:

The mass percent of iron in the given sample has to be determined.

Concept introduction:

  • The relation between the number of moles and mass of the substance is ,

     Numberofmole=MassingramMolarmass

     Mass in gram of the substance= Numberofmole×Molarmass

  • 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.
  • Stoichiometric factor is a relationship between reactant and product which is obtained from the balanced chemical equation for a particular reaction.
  • Amountof substance=Concentrationofsubstance×volumeofthesubstance
  • Mass percent of elements of a compound is the ratio of mass of element to the mass of whole compound and multiplied with hundred.
  • Titration is a method to determine the concentration of a substance in solution by adding a solution of known volume and concentration until the reaction is completed.
Explanation

Balanced chemical equation for the given reaction is,

  MnO4-(aq)+5Fe2+(aq)+8H3O+(aq)Mn2+(aq)+5Fe3+(aq)+12H2O(l)

From the balanced chemical equation it is clear that potassium permanganate (KMnO4) and iron (Fe) react in a 1:5ratio.

The amount (moles) of KMnO4 used in the titration can be calculated from its volume and concentration as follows,

  AmountofKMnO4 =CKMnO4×VKMnO4 =0

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