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Inorganic Chemistry

Oxyacids of sulfur :

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Sulfur forms many oxyacids. Some of these are,

Formula	Name	Important properties	Structural formula
H₂SO₃(+4)	Sulfurous acid	Free acid does not exist diprotic, strong reducing agent	O = S — OH \| OH
H₂SO₄(+6) (Oil of vitriol)	Sulfuric acid	Stable diprotic, dehydrating agent	O \|\| O = S — OH \| OH
H₂S₂O₃(–2 and +6)	Thiosulfuric acid	Free acid does not exist but its salts e.g. Na₂S₂O₃ All quite stable reducing agent	S \|\| O = S — OH \| OH
H₂S₂O₄(+3)	Dithionous acid		O O \|\| \|\| HO — S — S — OH
H₂S₂O₆(+5)	Dithionic acid	Free acid is moderately stable but its salts are quite stable.	O O \|\| \|\| HO — S — S — OH \| \| OH OH
H₂S₂O₇(+6) (Oleum)	Disulfuric acid (Pyrosulphuric acid)	Strong oxidizing agent	O O \|\| \|\| O = S — O — S = O \| \| OH OH
H₂SO₅(+6) (Caro's acid)	Peroxomonosulfuric acid (Its salts known as persulphates)	Stable crystalline solid, powerfull oxidizing agent	O \|\| HO —S — OOH \|\| O
H₂S₂O₈(+6) (Marshals acid)	Peroxodisulfuric acid (its salts are known as disulphates)	Strong oxidizing agent.	O O \|\| \|\| O = S — O — S = O \| \| OH OH

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