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Potassium Stannate, K2SnO3

Potassium Stannate, K2SnO3.3H2O, is prepared similarly to the sodium salt. It cannot, however, be completely dehydrated by heating, but decomposes, forming potassium hydroxide and stannic acid. Consequently the water present is water of hydroxylation rather than of hydration, and this and other salts are derived from hexahydroxy-stannic acid, H2Sn(OH)6, which is analogous to hexahydroxyplatinic acid, H2Pt(OH)6. This conclusion is confirmed by the fact that insoluble stannates obtained by double decomposition contain the same proportion of water. Thus precipitated lead stannate is PbSnO3.3H2O, and may be formulated PbSn(OH)6. This constitution relates hexahydroxystannates to the stanni-chlorides M'2SnCl6, which are analogous to the platini-chlorides M'2PtCl6. No orthostannates have hitherto been recognised, but Hedvall has prepared cobaltous orthostannate, Co2SnO4, by fusing cobaltous and stannic oxides with potassium chloride at 1100° C. or 1300°-1400° C., and dissolving out the excess of stannic oxide by warm, dilute hydrochloric acid. The product is dark green, and has a density of 6.30 at 18° C.

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