Determination of Iodine Value of Activated Carbon

Apparatus:

Volumetric flask,

conical flask,

beaker,

burette,

pipette,

filter paper

Reagents:

* 0.1N Iodine solution ( 40 gm KI in 1 Ltr of Distilled water ).

* 0.05N Sodium Thiosulphate solution (12.5 gm Na2S2O3.5H2O in 1 Ltr Distilled water)

* 1% Starch solution

* Activated carbon

Procedure:

I Standardisation of Iodine solution

* Take 10c.c of 0.1N Iodine solution in conical flask.

* Add 2 drops of Starch solution.

* The pale yellow colour of Iodine Soln turns Blue.

* Titrate with 0.05 N Sodium Thiosulphate till it becomes Colourless.

* Burette reading corresponds to blank reading.(B)

II

* Weigh very accurately 0.2 gm of Activated carbon

* Introduce it into the Iodine flask which should be completely dry

* Add 40cc of 0.1N Iodine solution

* Shake the flask for 4 minutes and filter it

* Collect the filterate in a dry flask and Titrate 10cc of the filtrate against

Standard Sodium thiosulphate solution using starch as indicator

* Burette reading corresponds to (A)

Calculations:

Iodine value: C x Conversion factor; mg/gm

Factor:Mol wt. of iodine (127) x normality of iodine x 40 / Wt. of carbon x Blank reading

C=B-A

Note: Iodine test should be performed on dry basis

Carbon should be dried in oven at 110oC for three hours before weighing

Iodine value is expressed in mg/gm of carbon

Article by Sivanandan

T.P.Sivanandan

1 Comments

  1. Ernest says:

    Gud day.I saw another formula about the iodine value of activated carbon,that they are using a conversion factor in the computation of iodine.The conversion factor depends on the normality of the filtrate?Is it the same with your formula?thanks

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