Colours of inorganic ions and complexes Flashcards
What is the colour of [Cu(H20)6]2+
- pale blue
- from cuso4 . 5H20
What is the colour of Cu(OH)2
- pale blue precipitate
- NH3 dropwise to Cu2+
What is the colour of [Cu(NH3)4(H20)2]2+
- dark blue
- excess NH3 to cu2+
What is the colour of CuCl4 2-
- yellow
- excess HCL to cu2+
What is the colour of Cu+
- white precipitate (CuI) and brown I2
- the reduction of Cu2+ with I-
What is the colour of Cu2+/Cu
- brown solid (Cu) and blue solution (CuSO4)
- disproportionation of Cu+
What is the colour of CoCl4 2-
- blue
- from COCl2 . 6H20 and excess HCL
What is the colour of [Cr(H20)6]3+
- pale purple, can seem green due to impurities (heat = green)
- from KCr(S04)2 . 12H20
What is the colour of Cr(OH)3
- dark green precipitate
- NH3 dropwise to Cr3+
What is the colour of [Cr(NH3)6]3+
- purple
- excess NH3 to cr2+
What is the colour of [Cr(OH)6]3-
- dark green
- excess OH- to Cr(OH)3
What is the colour of Cr207 2-
- orange
- from K2Cr207
What is the colour of CrO42-
- yellow
- oxidation of Cr3+ with hot alkaline H202
What is the colour of Mn(OH)2
- pale brown precipitate
- NaOH dropwise to Mn2+
What is the colour of [Fe(H20)6]2+
pale green
- from FeS04 ‘ 7H20
What is the colour of Fe(OH)2
dark green precipitate
NaOH dropwise to Fe2+
What is the colour of [Fe(H20)6]3+
yellow
from FeCl3 . 6H20
What is the colour of Fe(OH)3
orange brown precipitate
NaOH dropwise to Fe3+
What is the colour of Mn04-/Fe2+ to Mn2+/Fe3+
purple (Mn04-) to pale pink (Mn2+)
What is the colour of I-/Fe3+ to I2/Fe2+
Orange brown to brown
What is the colour of [Mn(H20)6]2+?
pale pink
form MnSo4 .4H20
