The percent of the oxygen (oxirane) absorbed by an unsaturated raw material during epoxidation. Determination of Oxirane Oxygen Content and Preparation of 0.1N HBr Solution and standrazition.
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 APPARATUS
b). 10 ml and 5 ml pipette.
c). 50 ml burette.
 REAGENTS
a). Glacial Acetic Acid.
b). Benzene.
c). Crystal violet Indicator.
d). 0.1 N HBr. Solution.
e). Potassium Hydrogen Phthalate (Lab Grade)
Preparation of Crystal Violet Indicator:
Take 0.1 gm of Crystal Violet powder and dissolve it in 100 ml of Glacial Acetic Acid.
Preparation of Potassium Hydrogen Phthalate solution Solution:
Take 0.4 gm of Potassium Hydrogen Phthalate and dissolve it in 10 ml of Glacial Acetic Acid a shake well with a slight warmth to get a clear solution.
Preparation of 0.1N HBr Solution:
Take 16.0 gm of HBr (Hydrobromic acid) (48%) Solution dissolve it in 1000 ml of Glacial Acetic Acid and standardize with Potassium Hydrogen Phthalate solution.
STANDARDIZATION OF 0.1 N HBr Solution
Take 10 ml of Potassium Hydrogen Phthalate solution in 100 ml of the conical flask. Then add 5-6Â drops of Crystal Violet indicator. Now titrate this solution with 0.1 N HBr Solution.
Calculation of 0.1N HBr:
Normality of 0.1N HBr Solution = Weight of Phthalate
              0.2024 X
V1
V1 = Volume of HBr Solution used.
PROCEDUREÂ
a.) Weigh about 0.3 – 0.5 gm of sample in 100 ml of a flask.
b.) Now add 10 ml and 5 ml of Acetic Acid, and shake well.
c.) Now add 5-6 drops of Crystal Violet Indicator and titrate with 0.1 N HBr Solution, till the Dark Blue color changes from Dark Green to Green.
Calculation of Oxirane Oxygen Content
Oxirane Oxygen Content (%)Â = Â Â V x N x 1.6
              W
V = Volume of HBr Solution used.
N = Normality of HBr Solution.
W = Weight of sample taken.
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