colours Flashcards
(20 cards)
what is the colour of [Cu(H2O)6]2+
pale blue solution
what is the colour of Cu(OH)2
how does it form it
pale blue precipitate
NH3 not in excess
what is the colour of [Cu(NH3)4(H2O)2]2+
how does it form it
dark blue
excess NH3
what is the colour of CuCl4 2-
yellow
what is the colour of Cu+
how does it form it
white precipiate (CuI)
and brown I2
by reduction of Cu2+ with I-
What is the colour of Cu2+/Cu
how does it form it
Cu = brown solid
CU2+ in CuSO4 = blue solution
disproportionation
what is the colour of CoCl4 2-
blue
what is the colour of [Cr(H2O)6]3+
pale purple
(heat => green)
(impurities makes it common to appear green)
what is the colour of Cr(OH)3
how does it form
dark green precipitate
NH3 not in excess
what is the colour of [Cr(NH3)6]3+
how does it form
purple
excess NH3
what is the colour of [Cr(OH)6]3-
how does it form
dark green solution
excess OH- to Cr(OH)3
what is the colour of [Mn(H2O)6]2+
pale pink
what is the colour of Mn(OH)2
pale brown ppt
what is the colour of [Fe(H2O)6]2+
pale green
what is the colour of Fe(OH)2
dark green ppt
what is colour of [Fe(H2O)6]3+
yellow
what is the colour of Fe(OH)3
orange-brown ppt
what colour is MnO4-
purplew
what colour is Mn2+
pale pink (slight)
what is the colour change when Fe3+ is reduced by I-
orange brown (Fe3+) to brown (I2)
