Aim: To determine the relative composition of a mixture solution containing sodium ethane-1, 2-dioate and ethane-1, 2-dioic acid.

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DETERMINATION OF THE RELATIVE COMPOSITION OF A MIXTURE SOLUTION

AIM

        To determine the relative composition of a mixture solution containing sodium ethane-1, 2-dioate and ethane-1, 2-dioic acid.

INTRODUCTION

        Potassium permanganate KMn is a strong oxidizing agent which reacts with reducing agent ethanedioate ion  to give  and C 

+ 2 Mn+ 16         2+8+10

        Sodium hydroxide (NaOH) reacts with acid to give water . the reaction is shown with the following equation

+         

        To investigate the relative composition of the mixture solution, it has to be titrated with NaOH first with phenolphthalein as indicator and then with acidify KMn as Mn react with both compound.

       KMnhas to be acidified first, otherwise brown ppt of Mn is formed instead of

2 H2O + MnO4 + 3 e → Mn+ 4

       In addition to that, the reaction solution has to be warmed to about 70 as the reaction rate is very slow.

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MATERIALS AND APPARATUS

beaker

measuring cylinder.

Safety spectacles

beaker            

conical flask

pipette ,25

burette ,50, and stand

wash bottle

white file

electrical heater

sulphuric acid  

Potassium permanganate KMn solution

Mixture solution

PROCEDURE

  1. 25.00of the mixture solution was transferred into a 250conical flask using a pipette rinsed by distilled water and the mixture solution
  2. The burette rinsed by distilled water and NaOH is filled with NaOH
  3. Titrate the mixture solution with 0.1M NaOH solotuion using phenolphthalein as indicactor
  4. Until the solution turns ...

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