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The Bunsen reaction is a chemical reaction that describes water, sulfur dioxide, and iodine reacting to form sulfuric acid and hydrogen iodide: . 2H 2 O + SO 2 + I 2 → H 2 SO 4 + 2HI ...
As a η 1-SO 2 (S-bonded planar) ligand sulfur dioxide functions as a Lewis base using the lone pair on S. SO 2 functions as a Lewis acids in its η 1-SO 2 (S-bonded pyramidal) bonding mode with metals and in its 1:1 adducts with Lewis bases such as dimethylacetamide and trimethyl amine.
Sulfurous acid is commonly known to not exist in its free state, and due to this, it is stated in textbooks that it cannot be isolated in the water-free form. [4] However, the molecule has been detected in the gas phase in 1988 by the dissociative ionization of diethyl sulfite. [5]
It is also a minor constituent of liquid anhydrous sulfuric acid due to the equilibria: . H 2 SO 4 ⇌ H 2 O + SO 3 SO 3 + H 2 SO 4 ⇌ H 2 S 2 O 7 2 H 2 SO 4 ⇌ H 2 O + H 2 S 2 O 7. The acid is prepared by reacting excess sulfur trioxide (SO 3) with sulfuric acid:
Calcium sulfite, or calcium sulphite, is a chemical compound, the calcium salt of sulfite with the formula CaSO 3 ·x(H 2 O). Two crystalline forms are known, the hemihydrate and the tetrahydrate, respectively CaSO 3 ·½(H 2 O) and CaSO 3 ·4(H 2 O). [2]
Sulfur dioxide (SO 2), a colorless gas with a pungent smell . Sulfonyl group (R-SO 2-R), a functional group found primarily in sulfones, or a substituent; SO(2), special orthogonal group of degree 2 in mathematics