Stannite (ion)
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The stannite ion is Sn(OH)3−, or similar.
There are stannite compounds, for example, sodium stannite, Na2SnO2.
See category for a list.
Stannite ion can be formed by adding strong base to stannous hydroxide.
Stannite ion is a strong reducing agent; also, it may disproportionate to tin metal plus stannate ion.