Transition Metals Flashcards
- What ligand complex is formed from CuSO4.5H2O?
- What colour does the complex form?
- [Cu(H2O)6]^2+
- Pale Blue
- What happens if you add NH3 drop wise to Cu^2+ (aq) ?
- What colour does it become?
A ligand complex called :
- Cu(OH)2 (s)
Colour of precipitate formed:
-Pale blue precipitate
- What happens if you add NH3 in excess to Cu^2+ (aq) ?
- What colour does it become?
Ligand Complex:
-[Cu(NH3)4(H2O)2]^2+
Colour of solution formed:
-Dark blue solution
- What happens when you add excess HCl to Cu2+ (aq)?
- What colour does it become?
- Solution formed:
CuCl4 2-
-Colour of solution formed:
Yellow
-What happens when you add I- to Cu2+?
-What colour does it form?
-Cu2+ is reduced to Cu+ to form a white precipitate of CuI and brown I2
Disproportionation of Cu2+ forms?
- Brown solid (Cu)
- Blue Solution (CuSO4)
How to form CoCl4^2- ?
What colour is CoCl4^2-?
- From CoCl2.6H2O plus water and excess HCl
-Blue
What forms when you add NH3 dropwise to Cr3+ (aq) ?
What colour is formed?
- Cr(OH)3 (s) is formed
- It’s a dark green precipitate
What forms when you add excess NH3 to Cr^2+ (aq)?
What colour is it?
- [Cr(NH3)6]^3+ forms
- It’s purple
What forms when you add excess OH- to Cr(OH)3 (s)?
What colour is the formed product?
- [Cr(OH)6]^3- forms
- The product is dark green
What forms when you react K2Cr2O7 (s) with 0.1moldm^-3 H2SO4?
What colour is the product that’s formed?
- Cr2O7^2- ions are formed
- The colour formed it orange
What forms when you oxidise Cr^3+ with hot alkaline H2O2?
What colour is product formed?
- CrO4^2- ions are formed
- Product formed is yellow
What forms if you add NaOH dropwise to Mn^2+ (aq)?
What colour is the product formed?
- Mn(OH)2 (s)
-Pale brown precipitate
What forms if you add NaOH dropwise to Fe^2+ (aq)?
- Fe(OH)2 (s)
- Dark green precipitate
What forms if you add NaOH dropwise to Fe^3+ (aq)?
- Fe(OH)3 (s) forms
- Orange-brown precipitate
