Determine the peroxide value in the of fat, Chemistry

Assignment Help:

Q. Determine the peroxide value in the of fat?

After undertaking this activity, you will be able to:

• determine the peroxide value in a given sample of fats/oils, and

• check whether any given samples of oils/fats conforms to the standard.

Principle

The peroxide value is a measure of the peroxides contained in a sample of fat expressed as milli-equivalents of peroxide per 1000 grams of the material. The material in an acetic acid-chloroform medium, is treated with an aqueous solution of potassium iodide. The liberated iodine is titrated with the standard sodium thiosulphate solution.

Materials Required

Reagents

Acetic acid-chloroform solution - Mix three parts by volume of glacial acetic acid with 2 parts by volume of chloroform

Saturated potassium iodide solution

Sodium thiosulphate solution- 0.1 N

Starch solution (1%)

Apparatus

Pipette 1ml capacity

Conical flask

Procedure

Carry out the experiment following the procedure given herewith:

1) Weigh approximately 5 g of the sample of fat in a 250 ml conical flask.

2) Add 30 ml of the acetic acid-chloroform solution.

3) Swirl flask until the sample is dissolved.

4) Add 0.5 ml of the saturated potassium iodide solution.

5) Allow the flask to stand exactly one minute with occasional shaking and then add 30 ml distilled water.

6) Titrate with 0.1 N sodium thiosulphate solution with constant and vigorous shaking.

7) Continue the titration until the yellow colour almost disappears.
8) Add 0.5 ml of the starch solution and continue the titration until the blue colour just disappears.

9) Conduct a blank determination of the process in the same manner as described in steps 2-8. Here, we start with acetic acid- chloroform solution only. No fat sample is added.


Related Discussions:- Determine the peroxide value in the of fat

Show the characteristic baked flavour bread, Q. Show the characteristic bak...

Q. Show the characteristic baked flavour bread? Bread has its own characteristic baked flavour. This flavour diminishes with shelf life. A freshly baked bread would have intens

Explain ethanolysis, Explain Ethanolysis Ethanolysis of the acetal link...

Explain Ethanolysis Ethanolysis of the acetal linkage occurs in ethanol just as hydrolysis occurs in water.  An ethyl pyranoside is also produced from the glucose residue at th

Sodium alkyl benzene sulphonates, Sodium alkyl benzene sulphonates Sodi...

Sodium alkyl benzene sulphonates Sodium p-dodecyl benzene sulphonate abbreviated as S.D.S. work as a good detergent. It is most broadly used since 1975. These long chai

BHC, structure and uses

structure and uses

How is aniline obtained from benzene, (a) How is aniline obtained from benz...

(a) How is aniline obtained from benzene? (b) Why are the secondary amines more basic than primary amines? Describe. (c) Write the complete chemical reactions for the convers

Explain classification of arches, Explain classification of arches accordin...

Explain classification of arches according to shapes raw a neat sketch of Flemish bond (1 brick wall and 1.5 brick wall thickness ).

Acetone react with (i)mg/h2o (ii)h2so4, This is an example of pinacone pina...

This is an example of pinacone pinacone rearrangemnt acetone with Mg and H2O forms 2,3 Dimethylbutane2.3 diol which on reacting with H+ from forms first a carbocation on carbon 2

Ions, Ask quAssuming that the ion formed has a noble gas configuration, wri...

Ask quAssuming that the ion formed has a noble gas configuration, write a chemical equation that shows the formation of an anion from a neutral selenium atom. estion #Minimum 100

Define the intrinsic semiconductor, Designate on an energy level diagram th...

Designate on an energy level diagram thee conduction and valence bands, acceptor & donor states and position of Fermi level for (i) An intrinsic semiconductor. (ii) A n-type

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd