What is the melting point of 1-naphthol?

What is the melting point of 1-naphthol?

Vapor Density (air=1) 4.5 @ 120°C. Solubility Soluble in alcohol, ether and benzene . Melting Point 96°C.

How is naphthol formed?

The compound 1-naphthol, or α-naphthol, made by heating 1-naphthalenesulfonic acid with caustic alkali or by heating 1-naphthylamine with water under pressure, is used directly in making several dyes, and large amounts of it are converted to compounds ultimately incorporated into other dyes.

How is alpha naphthol prepared from naphthalene?

Abstract In a new process for the prodn. of alpha-naphthol, (a) naphthalene is sulphonated with conc. H2SO4 at 30-85 degrees C for 60-120 mins. in the presence of acetic anhydride in an amount of 0.5-1.5 mol per mol naphthalene; (b) the resulting 1-naphthalenesulphonic acid is melted 10-30 mins.

How do you make one naphthol solution?

1-Amino-1-Naphthol-4-sulfonic acid Dissolve 0.2 g in 195 ml of sodium bisulphite solution (3 in20) and 5 ml of anhydrous sodium sulphite solution (1 in 5) and filter if necessary. Stopper and store in a cool dark place. Use within 10 days.

What is the melting point of 2-naphthol?

121 to 123 °C

Melting point 121 to 123 °C (250 to 253 °F; 394 to 396 K)
Boiling point 285 °C (545 °F; 558 K)
Solubility in water 0.74 g/L
Acidity (pKa) 9.51

Why Alpha naphthol is used in Molisch test?

The test is on the basis that pentoses and hexoses are dehydrated by conc. Sulphuric acid to form furfural or hydroxyl methyl furfural, respectively. These products condense with α-naphthol to form purple condensation product.

What is the boiling point of 2-naphthol?

545°F (285°C)2-Naphthol / Boiling point

How do you prepare alpha naphthol solution for Molisch test?

Molisch reagent: Dissolve 3.75 gm of α-naphthol in 25 ml of Ethanol 99%. This particular reagent should be prepared fresh.

Why alpha naphthol is used in Molisch test?

How do you make a Molisch reagent?

What is the preparation of reagents?

The standard practice is to use either distilled water or deionized water to prepare most reagent solutions. Many of these reagents are adequately buffered for maintaining specific hydrogen ion concentration measured by the pH of the solution.

What do you mean by melting point?

melting point, temperature at which the solid and liquid forms of a pure substance can exist in equilibrium. As heat is applied to a solid, its temperature will increase until the melting point is reached. More heat then will convert the solid into a liquid with no temperature change.