The element tin (AS. tin, stean, stan, a stone; L. stannum, found at Cornwall as oxide, tin-stone), official 1830-1860, occurs chiefly as native stannic oxide (tin-stone), SnO2. The metal is obtained by heating this oxide with carbon - SnO2 + 2C = Sn + 2CO. It is a nearly silver-white metal, very malleable, fusing at 228° C. (440° F.); forms two series of compounds, stannous and stannic; used in alloys, with mercury to silver mirrors, and to coat sheet iron to yield tin plate; stannous chloride, SnCl2, is a strong deoxidizing agent used to precipitate the metals mercury and gold, and as a mordant in calico-printing.
Tests for Tin Salts: 1. With H2S in stannous solution get brown stannous sulphide. 2. With H2S in stannic solution get yellow stannic sulphide, both precipitates being soluble in ammonium sulphide.