pyrosulfuric acid

pyrosulfuric acid Property

Melting point:

35°

Density 

1.89

EPA Substance Registry System

Disulfuric acid (7783-05-3)

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H314Causes severe skin burns and eye damage

H335May cause respiratory irritation

Precautionary statements

P260Do not breathe dust/fume/gas/mist/vapours/spray.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P301+P330+P331IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

P304+P340IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P310Immediately call a POISON CENTER or doctor/physician.

P321Specific treatment (see … on this label).

P363Wash contaminated clothing before reuse.

P405Store locked up.

P501Dispose of contents/container to..…

pyrosulfuric acid Chemical Properties,Usage,Production

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.