Tin hydroxides in the oxidation states II and IV are known. [Tin(II) hydroxide] The chemical formula is Sn(OH) 2 . When an aqueous solution of ammonia or a dilute alkali hydroxide is added to an aqueous solution of a tin salt such as tin(II) chloride (SnCl 2 ) , a white precipitate is obtained. The degree of hydration varies depending on the conditions of formation, and there is no fixed composition, but it is usually written as Sn(OH) 2 . When heated to 160°C or higher, it decomposes to produce tin(II) oxide (SnO). The solubility product calculated for the reaction Sn 2+ +2OH - ⇄SnO (solid) + H 2 O is [Sn 2+ ][OH - ] 2 = 6.3×10 -27 (mol/l) 3 (25°C, ionic strength 0). Source: Heibonsha World Encyclopedia, 2nd Edition Information |
酸化数IIおよびIVのスズの水酸化物が知られている。 [水酸化スズ(II)] 化学式Sn(OH)2。塩化スズ(II)SnCl2などのスズ塩の水溶液にアンモニア水あるいは希アルカリ水酸化物水溶液を加えると白色の沈殿として得られる。生成条件によって水和度が異なり一定の組成をもたないが,通常,Sn(OH)2と書かれる。160℃以上に熱すると分解して酸化スズ(II)SnOを生ずる。 Sn2++2OH-⇄SnO(固体)+H2Oの反応として求められる溶解度積は[Sn2+][OH-]2=6.3×10-27(mol/l)3(25℃,イオン強度0)。 出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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