Ullmann's Encyc. of Ind. Chem.:
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Tin(II) chloride , SnCl2 , is the most important inorganic tin(II) compound. It is produced on an industrial scale by reducing tin(IV) chloride with molten tin, or by direct chlorination of tin.
Solutions of tin(II) chloride are obtained by dissolving metallic tin in hydrochloric acid, or by reducing a solution of SnCl4 with metallic tin.
The anhydrous substance is white, has a greasy luster, and dissolves readily in water, alcohol, ethyl acetate, acetone, and ether. The clear, nondeliquescent, monoclinic dihydrate, SnCl2 · 2 H2O, crystallizes from aqueous solution and is the commercial product.
On dilution, the aqueous solution becomes cloudy as hydrolysis causes precipitation of the basic salt:
SnCl2 + H2O __> Sn(OH)Cl + HCl
The cloudiness can be prevented by small additions of hydrochloric acid, tartaric acid, or ammonium chloride. Because of its strong tendency to hydrolyze, the dihydrate can only be dehydrated over concentrated sulfuric acid or by heating in a stream of hydrogen chloride.
Tin(II) chloride is an important industrial reducing agent, being used to reduce aromatic nitro compounds to amines, aliphatic nitro compounds to oximes and hydroxylamines, and nitriles to aldehydes.
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Merck:
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8939. Stannous Chloride.
Tin dichloride; tin protochloride; Stannochlor.
Cl2Sn; mol wt 189.62. Cl 37.39%, Sn 62.61%. SnCl2.
Prepn: Stephen, J. Chem. Soc. 1930, 2786; Williams, Org. Syn. coll. vol. III, 627 (1955).
Orthorhombic cryst mass or flakes; fatty appearance.
bp 247 deg; d 3.95. Sol in water, ethanol, acetone, ether, methyl acetate, methyl ethyl ketone, isobutyl alcohol. Practically insol in mineral spirits, petr naphtha,xylene.
Dihydrate, crystals; absorbs oxygen from air and forms insol oxychloride. d 2.71. mp 37-38 deg when rapidly heated; dec on strong heating. Sol in less than its own wt of water; with much water it forms an insol basic salt; very sol in dil or in concd hydrochloric acid; also sol in alcohol, ethyl acetate, glacial acetic acid, sodium hydroxide soln. Keep tightly closed, in a cool place.
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A Merck catalogue database says:
dihydrate mp 40.5°C & sol in water = 1187 g/l(20°C)
Conclusions ?:
It probably won't oxidize as long as the soln is not dilute & there's some HCl around.
So evap appropriate amount of water, allow to cool & crystallize. Dry in dessicator (not for too long).
Store in sealed container.
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Mountain Boy