Abstract
Meissner's flame color test for tin has been investigated. The test is carried out as follows: The sample is mixed with concentrated hydrochloric acid and zinc, a test tube filled with water is dipped in this solution and the tube is held over the flame of a Bunsen burner to give a characteristic blue flame.The addition of zinc is found unnecessary in this case but the presence of hydrochloric acid is essential for this flame color reaction. The Sn4+ (0.010.05%) is distilled with hydrochloric acid vapor by heating the hydrochloric acid solution at about 150°C and the vapor gives a characteristic blue color in the Bunsen flame. Although Sn2+ is not distilled with hydrochloric acid, it gives colored flame by heating the hydrochloric acid solution in the Bunsen flame as it is rapidly oxidized to Sn4+.The above results confirmed that the flame color reaction for tin depends chiefly upon the volatility of SnCl4 (bp 114°C) and the reduction to SnH4 as reported by Meissner is unnecessary.
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