Selenous acid
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Selenous acid, H2SeO3, is an oxoacid of selenium.
Selenous acid is analogous to sulfurous acid, but it is quite definitely existent and stable, found as selenous acid molecules in solution, and obtainable as a crystalline solid.
Selenous acid is easily formed by adding selenium dioxide to water.
Selenous acid has a layer structure in the solid state, with SeO3 pyramids linked by hydrogen bonds. It is moderately oxidizing in nature, but kinetically slow.
In 1 M H+ :H2SeO3 + 4H+ + 4e− ⇌ Se + 3H2O Eo = +0.74 V
In 1 M OH− : SeO32− + 4e− + 3H2O ⇌ Se + 6OH− Eo = −0.37 V
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