Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4

Redox Titration: Permanganate against Oxalate (Ethanedioate)

Do not show me this again

Are you in the right place?

Jump to Chemistry and see how teachers think you should prepare in:

Extracts from this essay...

Introduction

Redox Titration: Permanganate against Oxalate (Ethanedioate) Aims: Find out the concentration of oxalic acid and oxalate by titration with sodium hydroxide. Chemical: Mixture of oxalic acid and oxalate, standard NaOH(about 0.05M), standard KMnO4(about 0.02M), 2M H2SO4, phenolphthalein indicator Apparatus: Titration apparatus, Bunsen burner Procedure: (A) Dilution The mixture of oxalic acid and oxalate should be diluted ten times. Using pipette filler pipette 25cm3 of given solution and dilute it to 250cm3 in a volumetric flask. The resulting solution can be used for subsequent titration. (B) Acid-base titration Titrate a 25cm3 portion of the diluted mixture against the given standard Sodium Hydroxide (0.05M).

Middle

Further heating is necessary during the titration as the mixture is cooled down. Repeat the titration at least twice. Data: (A) Morality of standard sodium hydroxide solution: 0.05M Titration volume (cm3) Trial 1 2 3 Final burette reading 4.00 7.50 10.95 14.50 Initial burette reading 035 4.00 7.50 10.95 Volume of NaOH used 3.65 3.50 3.45 3.55 (B) Morality of standard potassium permanganate solution: 0.02M Titration volume (cm3) Trial 1 2 3 Final burette reading 8.70 11.95 15.10 18.25 Initial burette reading 5.10 8.70 11.95 15.10 Volume of NaOH used 3.60 3.25 3.15 3.15 Calculation: (1)

Conclusion

original mixture is 0.0636M Discussion: We can also use the methyl orange, as the indicator because it also has a clear colour change during the titration .It will change to the yellow when it is in the acid condition. When it turns to alkali, it will turn to colourless. During the titration, if the temperature is below 70 C the reaction will very slow. It is because the optimum temperature of reaction is 70 C, when it reachs70 C the reaction become very effective. We cannot determine the concentration by weighting and dissolving in water because there are some impurities occurs. During the process, the solid is not 100% dissolve in the water and may polluted.

The above preview is unformatted text

Found what you're looking for?

  • Start learning 29% faster today
  • Over 150,000 essays available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Over 180,000 student essays
  • Every subject and level covered
  • Thousands of essays marked by teachers
  • Over 180,000 essays
    written by students
  • Annotated by
    experienced teachers
  • Ideas and feedback to write
    your own great essays

Marked by a teacher

This essay has been marked by one of our great teachers. You can read the full teachers notes when you download the essay.

Peer reviewed

This essay has been reviewed by one of our specialist student essay reviewing squad. Read the full review on the essay page.

Peer reviewed

This essay has been reviewed by one of our specialist student essay reviewing squad. Read the full review under the essay preview on this page.

Do not show me this again

Are you in the right place?

Jump to Chemistry and see how teachers think you should prepare in: