To prepare Iodoform from acetone

 EXPERINMENT 08

Object

To prepare Iodoform from acetone

Reference

1. Vogel Arthere, Elementary practical organic chemistry, 2nd edition, 1966, published by CBS publisher, page No. 198
2. Bahl A & Bahl B S, A text book of Organic chemistry, published by s chand and company limited, Edition: 22, page No. 309

Requirement

Conical flask, beaker, measuring cylinder

chemical:

1. Acetone             5ml
2. Iodine                 5 gram
3. NaOH solution  5%w/v

Theory

Iodoform, with the chemical formula CHI3, is a pale yellow, crystalline, volatile substance known for its distinctive, sweetish odor. It is an organoiodine compound and was historically used as a disinfectant and antiseptic in medicine. 

Iodoform also known as tri-iodo-methane is prepared from acetone and iodine crystals in the presence of aqueous sodium hydroxide solution

CH3COCH3+4I2+4NaOH——>  CHI3+3NaI+CH3COONa+2H2O

Procedure

1. Dissolve 5g of iodine in 5ml of acetone in a conical flask
2. Add 5% sodium hydroxide solution slowly with continuous shaking until all the iodine color is discharged
3. Allow the content of the flask to stand for about 10-15 minutes
4. Filter off the yellow crystalline ppt of Iodoform though Buchner funnel
5. Wash with little water and dried between the filter paper and weighed

Observation: Yellow color precipitate obtained. 

Result: Iodoform prepared successfully