Transition Metal Colours The colours of transition metals 4.0 / 5 based on 13 ratings ? ChemistryTransition metalsA2/A-level Created by: MaddieCreated on: 07-06-10 08:18 Transition metal colours Remember: Uncharged ions form a precipitate as they don't repel each other, so clump together. Charged ions repel each other, so form a solution. 1 of 7 Iron (II) compounds [Fe(H2O)6]2+ ,is a Pale Green Solution. [Fe(H2O)4(OH)2] ,is a Green Precipitate. This oxidises in air to a brown precipitate. FeCO3 ,is a Green precipitate. 2 of 7 Cobalt (II) compounds [Co(H2O)6]2+ ,is a Rose Pink Solution. [Co(H2O)4(OH)2] ,is a Blue-Green precipitate. [Co(NH3)6]2+ ,is a Pale yellow (straw) solution. CoCO3 ,is a Lilac Precipitate. [CoCl4]2- ,is a Blue Solution. 3 of 7 Copper (II) Compounds [Cu(H2O)6]2+ ,is a Blue Solution. [Cu(H2O)4(OH)2] ,is a Blue precipitate. CuCO3 ,is a Green Precipitate. [Cu(NH3)4(H2O)2]2+ ,is a Deep Blue Solution. [CuCl4]2- ,is a Yellow Green Solution. 4 of 7 Chromium (III) Compounds [Cr(H2O)6]3+ ,is a Ruby/Green solution. [Cr(H2O)3(OH)3] ,is a Green precipitate. [Cr(H2O)2(OH)4]- ,is a Green Solution. CrO4 2- ,is a yellow solution. Cr2O7 2- ,is an orange solution. [Cr(NH3)6]3+ ,is a Purple Solution. 5 of 7 Fe (III) Compounds [Fe(H2O)6]3+ ,is a very pale violet solution. [Fe(H2O)5(OH)]2+, is a Yellow Brown Solution. [Fe(H2O)3(OH)3] ,is a red brown precipitate. 6 of 7 Aluminium (III) Compounds [Al(H2O)6]3+ ,is a colourless solution. [Al(H2O)3(OH)3], is a white precipitate. [Al(H2O)2(OH)4]- , is a colourless solution. 7 of 7
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