Chemical reactions of the elementsReaction of arsenic with airArsenic is stable in dry air, but the surface oxidizes slowly in moist air to give a bronze tarnish and finally a black covering to the element. When heated in air, arsenic ignites "arsenic trioxide" - actually tetraarsenic hexaoxide, As4O6. This is accompanied by phosphorescence under some conditions. When heated in oxygen, arsenic ignites in oxygen to form "arsenic pentoxide" - actually tetraarsenic decaoxide, As4O10, and As4O6. 4As(s) + 5O2(g) → As4O10(s) 4As(s) + 3O2(g) → As4O6(s) Reaction of arsenic with waterArsenic does not react with water in the absence of air under normal conditions. Reaction of arsenic with the halogensArsenic reacts with fluorine, F2, to form the gas pentafluoride arsenic(V) fluoride. 2As(s) + 5F2(g) → 2 AsF5(g) [colourless] Arsenic reacts under controlled conditions with the halogens fluorine, F2, chlorine, Cl2, bromine, Br2, and iodine, I2, to form the respective trihalides arsenic(III) fluoride, AsF3, arsenic(III) chloride, AsCl3, arsenic(III) bromide, AsBr3, and arsenic(III) iodide, AsI3. 2As(s) + 3F2(g) → 2AsF3(l) [colourless] 2As(s) + 3Cl2(g) → 2AsCl3(l) [colourless] 2As(s) + 3Br2(g) → 2AsBr3(s) [pale yellow] 2As(s) + 3I2(g) → 2AsI3(s) [red] Reaction of arsenic with acidsReaction of arsenic with basesWebElements ShopWebElements now has a WebElements shop at which you can buy periodic table posters, mugs, T-shirts, games, molecular models, and more.
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