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|Section2= |Section7= |Section8= }} Sodium dithionite (also known as sodium hydrosulfite) is a white crystalline powder with a weak sulfurous odor. It is the sodium salt of dithionous acid. Although it is stable under most conditions, it will decompose in hot water and in acid solutions. It can be obtained from sodium bisulfite by the following reaction: :2 NaHSO3 + Zn → Na2S2O4 + Zn(OH)2 ==Structure== Raman spectroscopy and single-crystal X-ray diffraction studies of sodium dithionite in the solid state reveal that sodium dithionite exists in different forms. In one anhydrous form, the dithionite ion has C geometry, almost eclipsed with a 16° O-S-S-O torsional angle. In the dihydrated form (), the dithionite anion has a shorter S-S bond length and a gauche 56° O-S-S-O torsional angle. The weak S-S bond causes the dithionite anion to dissociate into the ()− radical anion in aqueous solution, which has been confirmed by ESR spectroscopy. It is also observed that 35S undergoes rapid exchange between S2O42− and SO2 in neutral or acidic solution, consistent with the weak S-S bond in the anion.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「sodium dithionite」の詳細全文を読む スポンサード リンク
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