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

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    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.

   In making my choice of indicator I also had to be very careful. The acid, which I use it, is a weak acid. So it will be appropriate to use phenolphthalein as it has an end point on the PH scale between 8-5. Methyl orange indicator has an end point much higher up in the ph scale. So if I were to use the methyl orange indicator then the end point (colour change) would be reached before the equivalence point (when the chemicals, acid-base break up).

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Balanced equation:  (COOH) 2 +2NaOH →(COONa) 2 + 2H2 O     

         

The quantities and concentrations of any reagents used:

   The volume of sodium hydroxide: x (between 7-9cm3)        

   The volume of the ethandioic acid: 250cm3

   The concentration of the sodium hydroxide which before the dilution: 1.00mol/dm3

   The concentration of the ethandioic acid:  2g/dm3   

 The volume of the water, which needs to mix with the sodium hydroxide: unknow

 

Preparation:

Planning a dilution:

Ethandioic was approx 2g/dm3 , sodium hydroxide was 1.0mol/dm3

Because of the equation:  

 (COOH) 2 +2NaOH (COONa) 2 + 2H2 O      ...

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