| Description |
Black, shiny non-metal solid, I2. Sublimes easily. Used in
disinfections, pharmaceuticals, food supplements, dyes, catalysts and
photography. Diagnostic tests:
Iodine salts (along with F, Cl, and Br) will give a blue color to flames
when heated on a copper disk.
Treatment of the salt with concentrated H2SO4 acid will effervesce with
the evolution of a violet, sharp smelling gas (l2). Iodine is sometimes found associated
with chlorine or bromine so a precipitate with AgNO3 solution is white (AgCl),
cream (AgBr), or yellow (AgI) depending on which anion predominates. The
precipitate is soluble in NH4OH.
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