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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

Vitamin C has the formula C6H8O6. Besides being an acid, it is a reducing agent. One method for determining the amount of vitamin C in a sample is to titrate it with a solution of bromine, Br2, an oxidizing agent.

C6H8O6(aq) + Br2(aq) → 2 HBr(aq) + C6H6O6(aq)

A 1.00-g "chewable" vitamin C tablet requires 27.85 ml of 0.102 M Br2 for titration to the equivalence point. What is the mass of vitamin C in the tablet?

Interpretation Introduction

Interpretation:

The mass of vitamin C C6H8O6 in the tablet has to be determined.

Concept introduction:

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

     Numberofmole=MassingramMolarmass

     Massingramofthesubstance=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
  • 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,

  C6H8O6(aq)+Br2(aq)2HBr(aq)+C6H6O6(aq)

From the balanced chemical equation it is clear that vitamin C, C6H8O6 and Bromine (Br2) react in a 1:1ratio.

The amount (moles) of Br2 used in the titration can be calculated from its volume and concentration as follows,

  AmountofBr2 = CBr2×VBr2 =0.102molL×0.02785L =0

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