To determine the concentration of a solution of ethandioic acid.

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TO DETERMINE THE CONCENTRATION OF A SOULTION OF ETHANDIOIC [OXALIC] ACID

INTRODUCTION

In this experiment, the concentration of a solution of ethandioic acid will be determined by following two main steps, which include:

Dilution of the Sodium Hydroxide.

Titration of dilute sodium hydroxide and ethandioic acid.

The indicator used will be phenolphthalein, which, will change from pink to colourless on neutralisation.

Precautions

Safety spectacles should be worn as acid is being used.

Sodium hydroxide is caustic so care should be taken at all times.

A white tile or white paper should be used to read off results to avoid errors.

Any recordings should be taken at eye level and at the bottom of the meniscus.

Dilution of Sodium Hydroxide (1.00mol dm-3)

Apparatus and chemicals needed for the dilution;

  • 250ml volumetric flask
  • Dropper
  • Burette
  • Clamp and stand
  • Distilled water
  • 1 mol dm-3 NaOH solution
  • White tile or paper
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Procedure:

  1. Clean and rinse your graduated flask. Clean a burette and rinse with distilled water until the water drains cleanly from the inverted burette.
  2. Fill the burette with the NaOH solution until the ‘zero’ mark with the aid of a funnel. Using a white tile placed behind the burette, at eye level, make sure the bottom of the meniscus touches the point zero.
  3. Place the volumetric flask under the burette tap and fill the flask with 9-11 cm3 of NaOH solution. Remember to remove the funnel before doing this!

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