pyrosulfuric acid Chemical Properties

Melting point:

35°

Density 

1.89

EPA Substance Registry System

Disulfuric acid (7783-05-3)

pyrosulfuric acid Usage And Synthesis

Uses

Pyrosulfuric acid is mainly used as an oxidizing agent, sulfonating agent, and dehydrating agent in nitration reactions, as well as in the production of dyes, explosives, petroleum product refining, and other organic sulfonic acid compounds.

Description

Disulfuric acid has the molecular formula of H2S2O7 where the S-atom is in the＋5 oxidation state. It is a major constituent of fuming sulfuric acid (also known as “oleum”) described by the formula ySO3·H2O where y is the total molar sulfur trioxide content. They can also be described by the formula: H2SO4·xSO3, which are also minor constituents of liquid anhydrous sulfuric acid due to the equilibria:
H2O＋SO3→H2SO4＋SO3→H2S2O7
Thus, the disulfuric acid is prepared by reacting excess SO3 with sulfuric acid:
H2SO4＋SO3→H2S2O7
Disulfuric acid is a strong acid and protonates sulfuric acid in the (anhydrous) sulfuric acid solvent system. An alternative IUPAC name is (sulfo-oxy)sulfonic acid.

Definition

ChEBI: Disulfuric acid is a sulfur oxoacid.

pyrosulfuric acid(7783-05-3)Related Product Information

• BARIUM SULFIDE
• Radium Sulfide
• MAGNESIUM SULFIDE
• BERYLLIUM SULFIDE
• CALCIUM SULFIDE
• Beryllium Sulfite
• Thiosulfuric acid
• FUMING SULFURIC ACID
• Strontium sulfide
• Hydrogen Sulfide