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Frage | Antworten |
How to generate [Cu(H2O)6]2+? | CuSO4 + 6H2O |
Reaction of Copper with excess ammonia | [Cu(H2O)6]2+ -> Cu(OH)2 -> [Cu(NH3)4(H2O)2]2+ |
Colour changes | Pale blue -> blue -> deep blue |
Cu with excess HCl | [Cu(H2O)6]2+(aq) + 4 Cl-(aq) <-> [CuCl4]2- (aq) + 6H2O (aq) IN EQUILIBRIUM! |
Colour changes | Pale blue --> Green IM --> Yellow |
Why only 4 Cl-? | As they're larger in size than water ligands, can only nestle this many around central metal ion. |
Generating [Cr(H2O)6]2+ | Chrome alum dissolved in water |
Colour of solution is | Pale purple |
What happens when Chromium(III) Sulfate is dissolved in water? | Green solution of [CR(H2O)5SO4]+ is formed |
What do the two solutions have in common? | Generate Cr3+ ions |
Reaction of [Cr(H2O)6]3+ with excess ammonia (3) | [Cr(H2O)6]3+(Aq) + 6 NH3(aq) -> Cr(OH)3(s) -> [Cr(NH3)6]3+(aq) + 6 H2O (l) |
Colour changes | pale purple -> grey-green -> purple |
What is the compound called that forms when CO binds to Hb? | Carboxyhaemoglobin |
What ppt form complex ions? | Those of transition metal ions that disolve in excess NaOH or NH3 |
Which compounds form ppt that DONT react with excess NaOH? | Cu2+ Fe2+ Fe3+ Mn2+ |
Cu2+ + NaOH Colour change | Cu2+ + 2OH- -> Cu(OH)2 (s) Blue solution --> Blue ppt |
Fe2+ colour | Pale green |
Fe(OH)2 colour | Green |
Fe3+ colour | pale yellow |
Fe(OH)3 colour | orange-brown |
Mn2+ colour | Pale pink |
Mn(OH)2 colour | light brown |
Reactions w/ excess ammonia | Fe2+/Fe3+/Mn2+ react in the same way they do w/ NaOH Cr3+ and Cu2+ are the ones that are further soluble to excess NH3 |
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