Transition metal colours Flashcards
What colour change occurs when NaOH is added to [Cu(H2O)6]^2+?
blue solution to pale blue precipitate
What colour change occurs when NaOH is added to [Cr(H2O)6]^3+?
violet solution to grey-green precipitate
What colour change occurs when excess NaOH is added to [Cr(H2O)6]^3+?
violet solution to dark green solution
What colour change occurs when excess NaOH is added to Cr(OH)?
grey-green precipitate to dark green solution
What colour change occurs when NaOH is added to [Fe(H2O)6]^2+?
pale green solution to green precipitate
What colour change occurs when NaOH is added to [Fe(H2O)6]^3+?
pale yellow solution to orange-brown precipitate
When Fe(OH)2 is oxidised in air, what colour change occurs?
it goes brown as its oxidised
What colour change occurs when dilute NH3 is added to [Cu(H2O)6]^2+?
blue solution to pale blue precipitate
What colour change occurs when concentrated NH3 is added to [Cu(H2O)6]^2+?
blue solution to deep blue solution
What colour change occurs when dilute NH3 is added to [Cr(H2O)6]^3+?
Violet solution to green precipitate
What colour change occurs when concentrated NH3 is added to [Cr(H2O)6]^3+?
Violet solution to purple solution
What colour change occurs when NH3 is added to [Fe(H2O)6]^2+?
green solution to green precipitate
What colour change occurs when NH3 is added to [Fe(H2O)6]^3+?
yellow solution to orange-brown precipitate
What colour change occurs when NaOH is added to [Mn(H2O)6]^2+?
pale pink solution to light brown precipitate
What colour change occurs when NH3 is added to [Mn(H2O)6]^2+?
pale pink solution to light brown precipitate
What colour change occur during the following reaction?
MnO4^- + 8H^+ → Mn^2+ + 4H2O + 5Fe^3+
Purple to pink
What colour change occurs when HCl is added to [Fe(H2O)6]^3+?
Yellow solution to yellow solution
What colour change occurs when iodide ions are added to Fe^3+?
Yellow to brown
the Fe^2+ would be green but the brown of the I2 is stronger
What colour change occurs when HCl is added to [Cu(H2O)6]^2+?
blue solution to yellow solution
What colour change occurs when iodide ions are added to [Cu(H2O)6]^2+?
blue solution to a brown solution with a white precipitate in
What colour change occurs when H2SO4 is added to Cu2O, write the two equations relevant to this.
The solution should go blue.
2Cu^+ (aq) → Cu (s) + Cu^2+ (aq)
2Cu2O2 (s) + H2SO4 → Cu (s) + CuSO4 (aq) +H2O (l)
What colour change occurs when zinc is added to dichromate ions?
orange to green
What colour change occurs when zinc is added to dichromate ions in acid?
green solution to blue solution
What colour change occurs when chromium ions are added to hot alkali?
green solution to yellow solution
What’s the equations for when NaOH is added to [Cu(H2O)6]^2+?
2OH^- + [Cu(H2O)6]^2+(aq) ⇌ Cu(OH)2(H2O)4 + 2H2O
What’s the equations for when dilute NH3 is added to [Cu(H2O)6]^2+?
2NH3 + [Cu(H2O)6]^2+(aq) ⇌ Cu(OH)2(H2O)4 + 2NH4^+
What’s the equations for when concentrate NH3 is added to [Cu(H2O)6]^2+?
4NH3 + [Cu(H2O)6]^2+(aq) ⇌ Cu(NH3)4(H2O)2 + 2H2O
What’s the equations for when NaOH is added to [Cr(H2O)6]^3+?
3OH^- + [Cr(H2O)6]^3+(aq) ⇌ Cr(OH)3(H2O)3 + 3H2O
What’s the equations for when excess NaOH is added to [Cr(H2O)6]^3+?
Cr(OH)3(s) + 3OH^-(aq) → [Cr(OH)6]^3-
What’s the equations for when dilute NH3 is added to [Cr(H2O)6]^3+?
3NH3 + [Cr(H2O)6]^3+(aq) ⇌ Cr(OH)3(H2O)3 + 3NH4^+
What’s the equations for when excess NH3 is added to [Cr(H2O)6]^3+?
6NH3 + [Cr(H2O)6]^3+(aq) ⇌ Cr(NH3)6 + 6H2O
What’s the equation for when HCl is added to [Cu(H2O)6]^2+?
[Cu(H2O)6]^2+ + 4Cl^- (aq) ⇌ [CuCl4]^2- + 6H2O
What’s the equation for when iodide ions are added to copper (II) ions?
2Cu^+ (aq) + 4I^- (aq) → 2CuI (s) + I2
