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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

You have a mixture of oxalic acid, H2C2O4, and another solid that does not react with sodium hydroxide. If 29.58 mL of 0.550 M NaOH is required to titrate the oxalic acid in the 4.554-g sample to the second equivalence point, what is the mass percent of oxalic acid in the mixture? Oxalic acid and NaOH react according to the equation

H2C2O4 (aq) + 2 NaOH(aq) → Na2C2O4(aq) + 2 H2O()sss

Interpretation Introduction

Interpretation:

The mass percentage of oxalic acid H2C2O4 in the sample has to be determined.

Concept introduction:

  • 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.
  • 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).
  • Stoichiometric factor is a relationship between reactant and product which is obtained from the balanced chemical equation for a particular reaction.
  • Concentrationofsubstance=amount of substance/volumeofthesubstance
  • Amountof substance=Concentrationofsubstance × volumeofthesubstance
  • Limiting reagent: Limiting reagent is a reactant, which consumes completely in the chemical reaction.  The quantity of the product depends on this limiting reagent, which can be determined with the help of balanced chemical equation for the reaction.
  • Mass percentage of elements of a compound is the ratio of mass of element to the mass of whole compound and multiplied with hundred.
Explanation

Balanced chemical equation for the given reaction is,

  H2C2O4(aq)+2NaOH(aq)Na2C2O4(aq)+2H2O(l)

Amount of NaOH can be calculated from its volume and concentration as follows,

  AmountofNaOH =CNaOH×VNaOH =0.550molL×0.02958L =0.01626molNaOH

Using the stoichiometric factor the amount of H2C2O4 can be calculated as follows,

  0

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