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tin(II) chloride


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A white solid, SnCl2, soluble in water and ethanol. It exists in the anhydrous form (rhombic; r.d. 3.95; m.p. 246°C; b.p. 652°C) and as a dihydrate, SnCl2.2H2O (monoclinic; r.d. 2.71; m.p. 37.7°C). The compound is made by dissolving metallic tin in hydrochloric acid and is partially hydrolysed in solution.Sn2++H2O⇌SnOH++H+ Excess acid must be present to prevent the precipitation of basic salts. In the presence of additional chloride ions the pyramidal ion [SnCl3] is formed; in the gas phase the SnCl2 molecule is bent. It is a reducing agent in acid solutions and oxidizes slowly in air:Sn2+ → Sn4++2e

Sn2++H2O⇌SnOH++H+

Sn2+ → Sn4++2e

Subjects: Chemistry.


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