7783-05-3 Usage
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.
Check Digit Verification of cas no
The CAS Registry Mumber 7783-05-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,8 and 3 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 7783-05:
(6*7)+(5*7)+(4*8)+(3*3)+(2*0)+(1*5)=123
123 % 10 = 3
So 7783-05-3 is a valid CAS Registry Number.
InChI:InChI=1/H2O7S2/c1-8(2,3)7-9(4,5)6/h(H,1,2,3)(H,4,5,6)
7783-05-3Relevant articles and documents
FTIR and computational studies of pure and water containing SO3 species in solid argon matrices
Givan, Aharon,Loewenschuss, Aharon,Nielsen, Claus J.,Rozenberg, Mark
, p. 21 - 34 (2007/10/03)
The FT infrared spectrum in the 4000-400 cm-1 range of SO3 vapors, matrix isolated in argon and in water doped argon solid layers, is reported. Vibrational bands are assigned to pure SO3 monomeric and polymeric species and to SO3?H2O complexes, on the basis of theoretical B3LYP and MP2 calculations employing the aug-cc-pVTZ basis sets. The spectroscopic evidence suggests that in addition to the monomer, both the dimeric and the cyclic trimeric (SO3)n complexes are the only other SO3 forms present in the matrix. The spectra also indicate the presence of the 1:1 and the 1:2 SO3·H2O complexes as well as traces of H2S2O7 and water complexed H2SO4, but no evidence for a stable 2:1 SO3?H2O complex was found. The occurrence of the various species is discussed in the light of their calculated energies.
