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To determine the concentration of a solution of ethandioic (oxalic) acid

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Introduction

To determine the concentration of a solution of ethandioic (oxalic) acid The aim of this experiment is to find the concentration of a sample of ethandioic acid in? g/dm3.i am require to design my own experiment and choose a range of appropriate equipment and apparatus. And think of the indicator as well. I am provided with 250cm3 ethandioic acid .the concentration is too much though so it is necessary to dilute it. The apparatus, equipment and chemicals that I will use are as follows: Equipment and apparatus: 1.pipette 25cm3 2.conical flask 250cm3 3.two burettes 4.white tile 5.clamp and stand 6.funnel 7.beaker 8.filler 9.distilled water 10.volumetric flask Chemicals: 1.indicator (phenolphthalein) 2.Ethandioic acid 3.sodium hydroxide In order to reduce errors it is necessary to choose accurate and reliable equipment. That is why I have chosen the pipette, and burette. All of these instruments have an accuracy of +0.1cm3,which is suitable for my experiment and should produce accurate and reliable results. ...read more.

Middle

2 + 2H2 O The sodium hydroxide needs to be diluted to give a titration, which has matched solution, i.e. in which 25cm3 pipette will react with approx 25cm3 from the burette Ethandioic: 2g/dm3 is of concentration 2/126=0.01587mol/ dm3 I.e. approx 0.016 mol/ dm3 To match this solution the ethandioic needs to be approx 0.032-mol/ dm3 The volumetric flask used for dilution has volume 250 cm3, let the volume required be v Because we know that: V1?C1=V2?C2 Where C1=the concentration of the concentrated solution V1=the volume of the concentrated solution C2=the concentration of the dilute solution V2=the volume of the dilute solution So, v�c=v�c V�1=250�0.032 V=8.00 cm3 The volume used for dilution is 7.00 cm3 to 9.00 cm3 Method: 1.Set up the apparatus, use a clamp to fix the burettes, one is on the left and one is on the right. 2. Put the funnel on the burette 1, and then pour the sodium hydroxide into the burette 1, and read the number carefully with ...read more.

Conclusion

7. Add 5 drops of phenolphthalein in the conical flask, now the colour of the solution is colourless. 8. Titrate with the diluted sodium hydroxide from the second burette. You must pour the solution very carefully, because you don't know when the solution will change colour. Firstly put the white tile under the conical flask to see the colour more clearly and then titrate it very slowly. Shake the conical flask very often and see if the solutions change the colour after some drops. When the colour has changed to pink, you've got the result. Record it. Repeat the titration as many times in order to get two results which agree to within 0.1 cm3.because it will make the results more accurate. Titration of ethandioic acid with diluted sodium hydroxide. Rough Accurate Final burette reading /cm3 Initial burette reading /cm3 Volume of diluted NAOH / cm3 Show that results you used to obtain this value of the volume of diluted sodium hydroxide by placing a tick under the readings used. ...read more.

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