Iodoform test is used to check the presence of carbonyl compounds with the structure R-CO-CH 3 or alcohols with the structure R-CH(OH)-CH 3 in a given unknown substance. The reaction of iodine, a base and a methyl ketone gives a yellow precipitate along with an “antiseptic” smell. It also tests positive for a few specific secondary alcohols ...

A positive result is the appearance of a very pale yellow precipitate of triiodomethane (previously known as iodoform) - CHI 3. Apart from its colour, this can be recognised by its faintly "medical" smell. It is used as an antiseptic on the sort of sticky plasters you put on minor cuts, for example.

2023年1月23日 · A positive result is the appearance of a very pale yellow precipitate of triiodomethane (previously known as iodoform): CHI 3, which apart from its color, can also be recognized by its faintly "medical" smell. It is used as an antiseptic on the sort of sticky plasters you put on minor cuts, for example.

2023年1月23日 · A positive result is the appearance of a very pale yellow precipitate of triiodomethane (previously known as iodoform) - CHI 3. Apart from its color, this can be recognised by its faintly "medical" smell. It is used as an antiseptic on the sort of sticky plasters you put on minor cuts, for example.

Warm the test tube gently, and if the test is positive, yellow crystals of iodoform (CHI₃) will appear as a precipitate, indicating the presence of a methyl ketone or suitable alcohol. To conduct the Iodoform Test, dissolve 0.1 g or 4-5 drops of the compound in 2 mL of water (add dioxane if needed for solubility).

A positive test result is indicated by the presence of a very pale-yellow precipitate or suspension of triiodomethane (formerly known as iodoform) – CHI 3. Aside from its colour, this can be identified by its mildly “medical” odour.

A positive result is the appearance of a very pale yellow precipitate of triiodomethane (previously known as iodoform) - CHI 3. Apart from its colour, this can be recognised by its faintly "medical" smell. It is used as an antiseptic on the sort of sticky plasters you put on minor cuts, for example.

Iodoform tests using l2 and NaOH are more commonly used. A pale yellow precipitate known as triiodomethane or iodoform is produced when iodine is added to the unknown compound that contains aldehydes or ketones in the presence of excess sodium hydroxide, and it has an "antiseptic" odour.

Shake vigorously using a small, tight fitting cork. You should see a color change to a blue or blue-green or similarly colored precipitate within a few seconds to indicate a positive test. Record your results in your notebook. This test is similar to the Chromic Acid Oxidation and provides the …

On reaction with iodine in alkaline conditions, the methyl group will be converted to triiodomethane or iodoform which gives us the observation of yellow precipitate. The carbon which carries the oxygen will be converted to salt of carboxylic acid or conjugate base of carboxylic acid, H/R-COO-