Chemical reactions of the elementsReaction of lanthanum with airLanthanum metal tarnishes slowly in air and burns readily to form lanthanum (III) oxide, La2O3. 4La + 3O2 → 2La2O3 Reaction of lanthanum with waterThe silvery white metal lanthanum is quite electropositive and reacts slowly with cold water and quite quickly with hot water to form lanthanum hydroxide, La(OH)3, and hydrogen gas (H2). 2La(s) + 6H2O(g) → 2La(OH)3(aq) + 3H2(g) Reaction of lanthanum with the halogensLanthanum metal reacts with all the halogens to form lanthanum(III) halides. So, it reacts with fluorine, F2, chlorine, Cl2, bromine, I2, and iodine, I2, to form respectively lanthanum(III) bromide, LaF3, lanthanum(III) chloride, LaCl3, lanthanum(III) bromide, LaBr3, and lanthanum(III) iodide, LaI3. 2La(s) + 3F2(g) → 2LaF3(s) 2La(s) + 3Cl2(g) → 2LaCl3(s) 2La(s) + 3Br2(g) → 2LaBr3(s) 2La(s) + 3I2(g) → 2LaI3(s) Reaction of lanthanum with acidsLanthanum metal dissolves readily in dilute sulphuric acid to form solutions containing the aquated La(III) ion together with hydrogen gas, H2. It is quite likely that La3+(aq) exists as largely the complex ion [La(OH2)9]3+ 2La(s) + 3H2SO4(aq) → 2La3+(aq) + 3SO42-(aq) + 3H2(g) Reaction of lanthanum 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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Lanthanum
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