SULFAMIC ACID

Sulfamic acid (H₃NSO₃) is a molecular chemical compound commonly named as Amidosulphuric acid, amino Sulfonic acid, Amidosulfonic acid, and Aminosulphuric acid. It is a colorless compound and finds many uses. Moreover, it is a water-soluble compound. It is a sand-like crystalline solid and neutralized by adding dilute hydroxide. It is also used for cleaning metals. It is a combustible compound.

Physical Properties

Its appearance is a white and crystalline powder. It has an orthorhombic crystal structure. It is soluble in MeOH and water by hydrolysis.  On decomposing, it emits toxic fumes of hydrogen chloride and Sulphur oxide. It is stable in dry form. It is not soluble in hydrocarbons. It is a strong and inorganic acid as solid is not hygroscopic. Sulfamic acid is non-volatile. It is an odorless solid. It is an acidic compound. Sulfamic acid is partially soluble in acetone.

Uses of Sulfamic acid

• It is used as a bleaching agent and finishing agent.
• It catalyzes urea-formaldehyde resins.
• It is used as an agriculture chemicals.
• It is used in dyeing wool.
• It is utilized for removing limescale and rust.
• It works as a chloride stabilizer in the pulp industry.
• It synthesizes nitrous oxide when reacts with nitric acid.
• It is used in anti-cancer drugs in the medical field.

Preparation

When sulphuric acid is heated with urea, we obtained Sulphamic acid. It can be prepared by treating chlorosulfonic acid and ammonia. In the laboratory, its formulation involves direct sulfonation of benzenesulfonic acid.

Chemical Properties

• It reacts with nitric acid and other acids too.
• Its heat of combustion is 1.53×10+7 J/kmol
• Its heat of formation is -6.749X10+8 J/kmol.
• Sulphamic acid solutions are less corrosive than HCl and sulphuric acid.
• Its aqueous solutions are highly ionized.
• It forms diammonium sulfate ions when hydrolyses slowly in solution.
• It also reacts with some bases.

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