2.5 - Transition Metals 2
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Half Equation: Reduction of VO²⁺ |> V³⁺
VO²⁺ + 2H⁺ + e⁻ |> V³⁺ + H₂O
Colour of VO²⁺?
Blue
Equation for the reduction of VO₂⁺ |> VO²⁺ by Zinc in Acid conditions?
2VO₂⁺ + 4H⁺ + Zn |> 2VO²⁺ + 2H₂O + Zn²⁺
Two factors that affect Redox potential?
Different ligands bind to metal ion differently pH - generally more easily reduced in acidic conditions therefore more positive redox potential
Steps for: Manganate Titration
|>Fill a Burette w/a standard solution of Potassium Manganate(VII) |>Pipette known volume of unknown solution into conical flask |>Add equal volume of H₂SO₄ |>Add Potassium Manganate(VII) until end point is reached |>Perform rough titration & then accurate ones until concordant titres are achieved
Colour of V²⁺?
Violet
Colour of V³⁺?
Green
Define: Redox potential of an ion
Measure of how easily an ion is reduced to a lower oxidation state
The more ____ the redox potential, the more likely the ion is to be ____ therefore the ion is less stable?
Positive Reduced
Overall Equation: Redox of Fe²⁺ w/ MnO₄⁻
MnO₄⁻ + 8H⁺ + 5Fe²⁺ |> Mn²⁺ + 4H₂O + 5Fe³⁺
The more ____ the redox potential, the more likely the ion is to be ____ therefore the ion is more stable?
Negative Oxidised
Half Equation: Reduction of V³⁺ |> V²⁺
V³⁺ + e⁻ |> V²⁺
Equation for the reduction of V³⁺ |> V²⁺ by Zinc in acidic conditions?
2V³⁺ + Zn |> V²⁺ + Zn²⁺
Overall Equation: Reduction of VO₂⁺ |> V²⁺ by Zinc in acidic conditions?
2VO₂⁺ + 8H⁺ + 3Zn |> 2V²⁺ + 4H₂O + 3Zn²⁺
Colour of VO₂⁺?
Yellow
Reduction half equation for Manganate?
MnO₄⁻ + 8H⁺ + 5e⁻ |> Mn²⁺ + 4H₂O
What are the 5 most common Oxidation States of Vanadium?
V²⁺, V³⁺, VO²⁺, VO₂⁺, V₂O₅ 2 , 3 , 4 , 5 , 5
Equation for the Reduction of VO²⁺ |> V³⁺ by Zinc in acid conditions?
2VO²⁺ + 4H⁺ + Zn |> 2V³⁺ + 2H₂O + Zn²⁺