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Experiment 13
Aim:
To determine the equilibrium constant for esterification from ethanoic acid and
propan-1-ol.
Procedure:
3 -3
1. 0.25 mole (equals to 14.3 cm ) of glacial ethanoic acid (density = 1.05 g cm )
3 -3
and 0.25 mole (equals to 18.8 cm ) of propan-1-ol (density = 0.8 g cm ) was
put into a clean, dry pear-shaped flask. It was mixed thoroughly.
3 3
2. 1.0 cm of the mixture was transferred by pipette to a 250 cm conical flask
3
containing about 25cm deionized water and 2 drops of phenolphthalein
indicator. It was titrated to end point with 0.50 M sodium hydroxide solution.
3
The titre (V cm )was recorded.
1
3. 8 drops of concentrated sulphuric(VI) acid was added to the remainder of the
3
acid-alcohol solutions while continuously swirling the flask. Another 1.0 cm
3
sample was titrated immediately. The titre (V2 cm )was recorded. The
difference between V 1 and V 2 Representsthe volume to be subtracted from
subsequent titration to correct for the amount of sulphuric (VI) acid present.
4. A few anti-bumping granules were added to the flask, and it was attached to a
water-cooled reflux condenser. It was refluxed for 1 hour. The flask and its
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