M(H2O)4(OH)2: Cu2+ Blue ppt, Co2+ Blue ppt, Fe2+ green ppt
9 of 19
Action of limited NH3 or NaOH 2+ ions
M(H2O)3(OH)3: Al3+ White ppt, Cr3+ Green ppt, Fe2+ Brown ppt
10 of 19
Amphoteric
Will dissolve/react with both acids and bases
11 of 19
Action of Excess NaOH
Chromium (III) and Aluminum (III) ppts will dissolve. [Cr(OH)6]3- is a green solution & [Al(OH)6]3- is a colourless solution
12 of 19
Action of Excess NH3
In Copper (II), Cobalt (II) and Chromium (III) ligand substitution occurs: [Cr(NH3)6]3+ Purple Solution, [Co(NH3)6]2+ Pale yellow solution & [Cu(NH3)4(H20)2]2+ Deep Blue solution.
13 of 19
Action of [CO3]2- ions
M2+ ions form MCO3 ppt: CuCO3 Blue-green ppt, CoCO3 Pink ppt & FeCO3 Green ppt. Mn3+ form hydroxide ppts.
14 of 19
Action of Cl- ions
Ligand substitution occurs in Copper (II) and Cobalt (II): [CuCl4]2- is a blue solution & [CoCl4]2- is a yellow solution but may look green.
Comments
No comments have yet been made