Polythionates Polythionates are oxoanions with the formula Sn 2 2- . They occur naturally and are the products of redox reactions of thiosulfate . Polythionates are readily isolable, unlike the parent polythionic acids.Preparation Many members of the polythionates have been characterized: dithionate , trithionate , tetrathionate , pentathionate, etc .thiosulfate ion with iodine :specialized routes involve reactions of sulfur chlorides with bisulfite salts:Potassium pentathionate ion has been obtained from SCl 2 , sodium thiosulfate , and potassium acetate . Initially prismatic crystals of potassium tetrathionate appear , then lamellar crystals of potassium pentathionate, from which the influence of tartaric acid makes an aqueous solution of pentathionic acid .2 S6 O6 has been synthesized by combining KNO 2 and K2 S2 O3 in concentrated HCl at low temperatures .
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