Chemical reactions of the elementsReaction of cerium with airCerium metal tarnishes slowly in air and burns readily to form cerium (IV) oxide, CeO2. Ce + O2 → CeO2 Reaction of cerium with waterThe silvery white metal cerium is quite electropositive and reacts slowly with cold water and quite quickly with hot water to form cerium hydroxide, Ce(OH)3, and hydrogen gas (H2). 2Ce(s) + 6H2O(g) → 2Ce(OH)3(aq) + 3H2(g) Reaction of cerium with the halogensCerium metal reacts with all the halogens to form cerium(III) halides. So, it reacts with fluorine, F2, chlorine, Cl2, bromine, I2, and iodine, I2, to form respectively cerium(III) bromide, CeF3, cerium(III) chloride, CeCl3, cerium(III) bromide, CeBr3, and cerium(III) iodide, CeI3. 2Ce(s) + 3F2(g) → 2CeF3(s) [white] 2Ce(s) + 3Cl2(g) → 2CeCl3(s) [white] 2Ce(s) + 3Br2(g) → 2CeBr3(s) [white] 2Ce(s) + 3I2(g) → 2CeI3(s) [yellow] Reaction of cerium with acidsCerium metal dissolves readily in dilute sulphuric acid to form solutions containing the colourless aquated Ce(III) ion together with hydrogen gas, H2. It is quite likely that Ce3+(aq) exists as largely the complex ion [Ce(OH2)9]3+ 2Ce(s) + 3H2SO4(aq) → 2Ce3+(aq) + 3SO42-(aq) + 3H2(g) Reaction of cerium 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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