Chemistry & Chemical Reactivity

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



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


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,                      


  • 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.

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


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,


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