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Volumetric Analysis

-Introduction

-Calculate Concentration Oxalic Acid

-Preparation of a Starndard Solution

-Evaluation Question: Virtual Lab



Experiment 4 Online Tutorial >> Volumetric Analysis: Potassium Permanganate Titration >> Introduction

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Experiment 4 - Volumetric Analysis: Potassium Permanganate Titration

Introduction

In this experiment, your goal is to determine the concentration of unknown KMnO4 using sodium oxalate of known concentration.

The experimental setup and strategy are shown below.

Step 1: Preparing a Sodium oxalate of known concentration

    What concentration do I want?
          Determine the concentration of the oxalic acid for 25.00 mL of it to react completely with 25 mL of 0.01 M KMnO4 solution using the Calculate Concentration Oxalic Acid tutor on page 2.

    How do I make the solution?
          See Canvas EXP 4 Module on Making a Standard Solution.

    What glassware do I use?
          See Canvas EXP 4 module on Significant Figures & Volumetric Analysis.

Step 2: Performing the Titration

Add titrant until solution turns constant pale pink colour.

    Why does it turn pink?
          Titration of KMnO4 (purple) into the oxalate solution (colourless), produces colourless Mn2+ until the end point. At the end point, the oxalate solution will be exhausted and the purple solution colour will be permanent.

    How do I interpret the results?
          When performing volumetric analysis calculations, consider how you will calculate the amount (number of moles) of KMnO4 in solution. This experiment uses a known amount of sodium oxalate. From this amount, consider how you can determine the concentration of KMnO4. Remember to consider the stoichiometry of this reaction in your calculations.

    2MnO4- + 6H+ + 5H2C2O4 --> 2Mn2+ + 8H2O + 10CO2

    Practice this reaction in the Virtual Lab
          Perform a virtual titration of this problem using the ChemCollective Virtual Laboratory on page 4 of this tutorial.

The following pages contain tutors to assist you in the calculations required for the above steps. Please click next to continue to the tutors.

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Last Updated: Tuesday, May 29th, 2018 @ 02:07:40 pm