metal-aqua ions 3.0 / 5 based on 1 rating ? ChemistryRedoxA2/A-levelAQA Created by: emmaCreated on: 20-04-13 17:22 which metal hydroxides are amphoteric? aluminium hydroxide and chromium(III) hydroxide 1 of 17 metal 2+ ions react with sodium carbonate to form... insoluble metal carbonates 2 of 17 metal 3+ ions always form... with sodium carbonate. hydroxide precipitates 3 of 17 with OH- or NH3 , all of the metal aqua ions form ... the neutral hydroxide precipitate. 4 of 17 with excess OH- chromium forms... green solution of [Cr(OH)6]3- 5 of 17 with excess OH-, aluminium forms... [Al (h2O)2(OH)4]- ( colourless solution) 6 of 17 copper and excess NH3 [Cu (NH3)4(H2O)2]2+ deep blue solution 7 of 17 chromium with excess NH3 [Cr(NH3)6]3+ purple solution 8 of 17 what colour ia [CoCl4]2- ? blue (also tetrahedral shaped) 9 of 17 what colour is [CuCl4]2- ? yellow (also tetrahedral shaped) 10 of 17 what is the chelate effect? when an increase in number of particles and therefore entropy makes a reaction more likely to occur. 11 of 17 according to lewis theory, an acid is an... electron pair acceptor 12 of 17 according to levis theory, bases are... electron pair donors, forming a co-ordinate bond with a lewis acid 13 of 17 bronsted lowry acids... are all lewis acids. 14 of 17 why are dilute solutions of iron 2+ and iron 3+ hard to tell apart? they are pale green and pale brown respectivley. 15 of 17 what is the test to distinguish the two iron ions? add dilute alkali. this precipitates the hydroxides whose colours are more easily distinguishable. 16 of 17 how does aluminium display amphoteric properties? it acts like a normal metal hydroxide and reacts with acid => it is basic.it also reacts with NaOH to give colourless tetrahydroxoaluminate. 17 of 17
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