Dithionate

Dithionates (deprecated also Hypodisulfate ) are the inorganic salts of the volatile dithionic ( disulfur (V ) acid, H2S2O6 ) and weak oxidant. The salts consist of a dithionate ion S2O62, which is present in the acidic medium ( H excess) as a dianion, and a metal cation. The dithionate anion has at both Schwefelatomem on a tetrahedral arrangement and is sterically comparable with Ethan. There is also a staggered and an eclipsed conformation; in the hydrate of sodium dithionate Na2S2O6 · 2H2O, the arrangement is staggered, while the anhydrous salt is built eclipsed.

Dithionates are formed normally not directly from the dithionic, but with the help of a more stable acid. The dithionic used here only as registered common. As an example, the formation of manganese ( II) dithionate from Braunstein and sulfurous acid (schematic) are given:

And anodic oxidation of hydrogen sulfates dithionates can be produced.

Like the dithionic the dithionates disproportionate on heating or acidifying slightly in SO2 and SO42 -. For example, decomposes at 258 ° C in Kaliumdithionat potassium sulphate and sulfur dioxide.