Chemical reactions of the elementsReaction of praseodymium with airPraseodymium metal tarnishes slowly in air and burns readily to form a praseodymium oxide which has the approximate formula Pr6O11. 12Pr + 11O2 → 2Pr6O11 Reaction of praseodymium with waterThe silvery white metal praseodymium is quite electropositive and reacts slowly with cold water and quite quickly with hot water to form praseodymium hydroxide, Pr(OH)3, and hydrogen gas (H2). 2Pr(s) + 6H2O(g) → 2Pr(OH)3(aq) + 3H2(g) Reaction of praseodymium with the halogensPraseodymium metal reacts with all the halogens to form praseodymium(III) halides. So, it reacts with fluorine, F2, chlorine, Cl2, bromine, I2, and iodine, I2, to form respectively praseodymium(III) bromide, PrF3, praseodymium(III) chloride, PrCl3, praseodymium(III) bromide, PrBr3, and praseodymium(III) iodide, PrI3. 2Pr(s) + 3F2(g) → 2PrF3(s) [green] 2Pr(s) + 3Cl2(g) → 2PrCl3(s) [green] 2Pr(s) + 3Br2(g) → 2PrBr3(s) [green] 2Pr(s) + 3I2(g) → 2PrI3(s) Reaction of praseodymium with acidsPraseodymium metal dissolves readily in dilute sulphuric acid to form solutions containing the green aquated Pr(III) ion together with hydrogen gas, H2. It is quite likely that Pr3+(aq) exists as largely the complex ion [Pr(OH2)9]3+ 2Pr(s) + 3H2SO4(aq) → 2Pr3+(aq) + 3SO42-(aq) + 3H2(g) Reaction of praseodymium 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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