Ligand Sub & Interconversions Flashcards
What is the colour of Cu2+ (aq) solution?
Blue
What is the precipitate formed when NaOH is added to Cu2+ (aq)?
Blue precipitate
What is the ionic equation for the precipitation reaction of Cu2+ (aq) with NaOH (aq)?
Cu2+ (aq) + 2OH- (aq) 🡪 Cu(OH)2 (s)
What is the observation when NH3 (aq) is added in excess to Cu2+ (aq)?
Dark blue solution
What is the ionic equation for the reaction when the precipitate of Cu(OH)2 dissolves in excess NH3 (aq)? Use complex ion formulas.
[Cu(H2O)6]2+ (aq) + 4NH3 (aq) 🡪 [Cu(NH3)4(H2O)2]2+(aq) + 4H2O (l)
Ionic equation for the reaction when the precipitate of [Cu(H20)6]2+ dissolves in excess HCl. (Use complex ion formulas.
[Cu(H2O)6]2+ (aq) + 4Cl- (aq) 🡪 [CuCl4]2- (aq) + 6H2O (l)
What is the color of Fe2+ (aq) solution?
Pale green
What precipitate is formed when NaOH is added to Fe2+ (aq)?
Green precipitate
What is the ionic equation for the precipitation reaction of Fe2+ (aq) with NaOH (aq)?
Fe2+ (aq) + 2OH- (aq) 🡪 Fe(OH)2 (s)
What is the color of Fe3+ (aq) solution?
Yellow
What colour precipitate is formed when NaOH is added to Fe3+ (aq)?
Rusty-brown precipitate
What is the ionic equation for the precipitation reaction of Fe3+ (aq) with NaOH (aq)?
Fe3+ (aq) + 3OH- (aq) 🡪 Fe(OH)3 (s)
What is the color of Mn2+ (aq) solution?
Pale Pink
What colour precipitate is formed when NaOH is added to Mn2+ (aq)?
Light brown precipitate
What is the ionic equation for the precipitation reaction of Mn2+ (aq) with NaOH (aq)?
Mn2+ (aq) + 2OH- (aq) 🡪 Mn(OH)2 (s)
What is the color of Cr3+ (aq) solution?
Violet
What colour precipitate is formed when NaOH is added to Cr3+ (aq)?
Grey-green precipitate
What is the ionic equation for the precipitation reaction of Cr3+ (aq) with NaOH (aq)?
Cr3+ (aq) + 3OH- (aq) 🡪 Cr(OH)3 (s)
Equation for when Cr(OH)3 (s) reacts with excess NaOH (aq)? (this is the only precipitate that does)
Cr(OH)3 (s) + 3OH- 🡪 [Cr(OH)6]3-(aq)
What is the colour of the solution formed from dissolving [Cr(OH)6]3- (aq) in excess NH3?
Purple solution
What is the ionic equation for the reaction when the precipitate of [Cr(OH)6]3+ (aq) dissolves in excess NH3 (aq)? Use complex ion formulas.
[Cr(H2O)6]3+(aq) + 6NH3(aq) 🡪
[Cr(NH3)6]3+(aq) + 6H2O(l)
What is the observation when Fe2+, Fe3+, and Mn2+ react with excess NH3 (aq)?
No further reaction occurs
What is the oxidation reaction of Fe2+ to Fe3+ using H+/MnO4-?
Fe2+ 🡪 Fe3+ + e-
What is the reduction reaction of MnO4- using Fe2+?
MnO4- + 8H+ + 5e- 🡪 Mn2+ + 4H2O
What is the overall redox reaction for the oxidation of Fe2+ by MnO4-?
MnO4- + 8H+ + 5Fe2+ 🡪 Mn2+ + 5Fe3+ + 4H2O
What is the observation during the oxidation of Fe2+ to Fe3+ with MnO4-?
Purple (MnO4-) 🡪 Colourless
Reduction of Fe3+ and Fe2+ using I- from KI: oxidation equation
Fe3+ + e- 🡪 Fe2+
Reduction of Fe3+ and Fe2+ using I- from KI: reduction equation
2I- 🡪 I2 + 2e
What is the overall redox reaction for the reduction of Fe3+ using I- from KI?
2Fe3+ + 2I- 🡪 2Fe2+ + I2
What is the observation during the reduction of Fe3+ to Fe2+ using I-?
Colourless 🡪 Brown (I2)
Reduction of Cr2O72- to Cr3+ using H+/Zn (this is to convert 6+ ox state to 3+): oxidation equation
Zn 🡪 Zn2+ + 2e-
Reduction of Cr2O72- to Cr3+ using H+/Zn (this is to convert 6+ ox state to 3+): reduction equation
Cr2O72- + 14H+ + 6e- 🡪 2Cr3+ + 7H2O
Reduction of Cr2O72- to Cr3+ using H+/Zn (this is to convert 6+ ox state to 3+): overall redox equation
Cr2O72- + 14H+ + 3Zn 🡪 2Cr3+ + 3Zn2+ + 7H2O
What is the observation when Cr2O72- is reduced to Cr3+?
Orange (Cr2O72-) 🡪 Green (Cr3+)
In presence of excess Zn… Further reduction occurs of Cr3+ to Cr2+: reduction equation
Cr3+ + e- 🡪 Cr2+
In presence of excess Zn… Further reduction occurs of Cr3+ to Cr2+: oxidation equation
Zn 🡪 Zn2+ + 2e-
What is the overall redox reaction for the further reduction of Cr3+ to Cr2+ using Zn?
2Cr3+ + Zn 🡪 2Cr2+ + Zn2+
What is the observation during the further reduction of Cr3+ to Cr2+?
Green (Cr3+) 🡪 Blue (Cr2+)
Oxidation of Cr3+ to CrO42– using OH-/H2O2: oxidation reaction
Cr3+ + 8OH- 🡪 CrO42- + 4H2O + 3e-
Oxidation of Cr3+ to CrO42– using OH-/H2O2: reduction reaction
H2O2 + 2e- 🡪 2OH-
What is the overall redox reaction for the oxidation of Cr3+ to CrO42- using OH-/H2O2?
3H2O2 + 2Cr3+ + 10OH- 🡪 2CrO42- + 8H2O
What is the observation during the oxidation of Cr3+ to CrO42-?
Green (Cr3+) 🡪 Yellow (CrO42-)
What is the overall redox reaction for the reduction of Cu2+ to Cu+?
2Cu2+ (aq) + 4I- (aq) 🡪 2CuI (s) + I2 (s)
What is the observation during the reduction of Cu2+ to Cu+?
Blue (Cu2+) 🡪 White precipitate
What is the equation for the disproportionation of Cu+?
2Cu2O (s) + H2SO4 (aq) 🡪 Cu (s) + CuSO4 + H2O
What is the oxidation state change for Cu in the disproportionation reaction?
+1 to +2 and +1 to 0
