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Acid Catalysis

The document outlines an experiment to determine the rate constant of acid-catalyzed hydrolysis of Ethyl acetate. It details the procedure involving the use of HCl and NaOH for titration to measure the reaction's progress over time. The results include both calculated and graphical values for the rate constant, along with an assessment rubric for evaluating the experiment.

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S.Sharvesh
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6 views4 pages

Acid Catalysis

The document outlines an experiment to determine the rate constant of acid-catalyzed hydrolysis of Ethyl acetate. It details the procedure involving the use of HCl and NaOH for titration to measure the reaction's progress over time. The results include both calculated and graphical values for the rate constant, along with an assessment rubric for evaluating the experiment.

Uploaded by

S.Sharvesh
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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DETERMINATION OF ACID-CATALYZED HYDROLYSIS KINETICS IN LOCALLY

SOURCED FRUIT EXTRACTS

AIM/ OBJECTIVE
To determine the rate constant of the hydrolysis of Ethyl acetate using an acid as a
catalyst.

PRINCIPLE
The hydrolysis of an ester occurs according to the equation
CH3COOC2H5 + H2O CH3COOH + C2H5OH
This reaction follows pseudo first order kinetics.

PROCEDURE
100 ml of 0.5 N HCl is taken in a clean dry conical flask. 5 ml of ester is pipetted out into
the conical flask and the mixture is immediately withdrawn into another dry conical flask. A stop
watch is started simultaneously. The reaction is then arrested by the addition of ice cubes and the
mixture is titrated against 0.2 N NaOH using phenolphthalein as indicator. End point is the
appearance of permanent pink colour. The volume of NaOH consumed in this titration is taken as
V0.

5 ml of acid – ester mixture is similarly withdrawn after 10, 20, 30, ..., 60 minutes
respectively and titrated against NaOH using phenolphthalein as indicator. The volume of NaOH
consumed for each of the above time intervals (t), is taken as Vt.
The contents are transferred into boiling tube with a cap and heated in a water bath forabout
15 minutes. 5 ml of this mixture is withdrawn and titrated against NaOH to get V∞.
22CH203 – Engineering Chemistry II

CALCULATION:

The rate constant K is determined using the equation,

Rate constant is determined by plotting,

1
22CH203 – Engineering Chemistry II

RESULT:

The Rate Constant for the hydrolysis of an ester from

1. Calculated value =

2. Graphical value =

MAPPING OF PO & PSO: (For all the COs covered by this experiment)

CO No PO1 PO2

1 2 1

ASSESSMENT:

Particulars Max. Marks


Marks awarded

Preparation 10

Conduct of Experiment 30

Results & Discussion 30

Viva - Voce 20

Report 10

Total 100

Evaluator’s Signature

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22CH203 – Engineering Chemistry II

Declaration

The students has completed all the experiments as per the course syllabus on_____________

Signature of Faculty

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