1- Napthol Soln.

Napthol Soln. (Naphthol Solution) refers to a laboratory or industrial reagent solution made using naphthol, an aromatic organic compound derived from naphthalene. There are two isomers, 1-naphthol (alpha-naphthol) and 2-naphthol (beta-naphthol), which are used in various chemical tests and dye formulations.​

Chemical Properties

Chemical formula:

C

10

H

7

O

H

C

10

H

7

OH (naphthol base).​

Structure: Consists of a naphthalene ring system with an attached hydroxyl (-OH) group.​

Forms: Typically found as a white or colorless crystalline solid; both 1-naphthol and 2-naphthol can be dissolved in alcohol to make laboratory solutions.​

Solubility: Insoluble in water, soluble in alcohol and alkaline solutions.​

Uses of Naphthol Solution

Molisch's Test: 1-naphthol solution is used as a reagent in Molisch's test for the detection of carbohydrates.​

Dye Manufacturing: Often serves as a precursor for the synthesis of azo dyes and other dyes for textiles.​

Analytical Chemistry: Used as a colorimetric reagent in laboratories.​

Disinfectant/Antiseptic: Sometimes used in soaps and lotions for its antiseptic properties.​

Laboratory/Reagent Solution Details

Typical preparation: 1-naphthol solution for Molisch's reagent is usually a 5% or 10% solution in ethanol or another suitable alcohol.​

Appearance: Colorless to slightly off-white liquid when in alcoholic solution.​

Storage: Store at room temperature, away from direct sunlight, and in tightly closed containers.​

Safety

Toxicity: Moderately toxic if ingested or absorbed; handle with gloves and eye protection.​

Flammability: Alcoholic solutions are flammable and should be kept away from open flame.​