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Sodium dithionite
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<p>Sodium dithionite (also known as sodium hydrosulfite) is a white <a href="/facts/Crystal/e2R2mk3E">crystalline</a> powder with a sulfurous odor. Although it is stable in dry air, it <a href="/facts/Chemical_decomposition/4X3oxvhb">decomposes</a> in hot <a href="/facts/Water/0lkXnJPK">water</a> and in <a href="/facts/Acid/FySU18n1">acid</a> <a href="/facts/Solution_(chemistry)/MGchhMQV">solutions</a>. </p>