[PDF] EXPERIMENT 7 DETERMINATION OF SAPONIFICATION VALUE





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EXPERIMENT 7 DETERMINATION OF SAPONIFICATION VALUE

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E X PE R

IMENT7DETERMINATIONOF

SA P

ONIFICATION

VALUE St m cture 7

1Introduction

Ob je ct iv e 7 .2Experiment 7

2.IPrinciple

7 2

2Requirements

7 2

3Procedure

7 2

4Observation

7 2

5Calculations

7

2.6Results

7

3Precautions

7.1INTRODUCTION

h y drol y sisof1gofthesample. C 3 H 5 (C I 7H 3 5COO

3+3KOH=C3H5(OH)3+3CI7H35

COOK Ste a rinGlycerolPotassiumstearate T saponification ofthemolecularweightsofthefattyacidsin th eglyceridespresent.Asmanyoils ha v

188-196

purposes 225)

Thepresenceof

par a et hanol icsaponifiedoilorfatsolution.

Objective

•determinethesaponificationvalu

eofoil.

7.2EXPERIMENT

7. 2

1Principle

PracticalManualforPulses

andOilseeds onegramoftheoilorfat.

7.2.2Requirements

0

100gPotassiumhydroxide

ii 1 0

0mlaldehydefreealcohol

iiD H y dro ch l o ri cacid(0.5N) i v) Pipet t e25ml v)Conicalflask250ml v i

Fewpiecesofpumice

vii)5mlofphenolphthalein(1percent) viii )Burette

7.2.3Procedure

M e o ha v g las c n A ll ind ica t Whe alk a mixedbeforetitration).

7.2.4Observation

S.NoWeightofBlanktitreSampletitre

sa mpl e(g)value(b)value(a)

7.2.5Calculations

thi o c ya nogenrespectivelyatdoublebonds.

7.2.6ResultsDeterminationof

SaponificationValue

7.3PRECAUTIONS

cleanandfreeofanyimpurities. ii)Carryoutthetitrationmostaccurately. 27
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