Manganate equations

Question 1

What is the oxidation state change for Mn in potassium manganate when used as an oxidising agent?

MnO₄⁻ ions are reduced

Answer 1

+7 → +2
-5 change

MnO₄⁻ becomes Mn²⁺

Question 2

What is the half equation for potassium manganate as an oxidising agent?

MnO₄⁻ ions are reduced

Answer 2

MnO₄⁻ + 5e⁻ + 8H⁺ → Mn²⁺ + 4H₂O

Question 3

What is the oxidation state change when Fe²⁺ ions are oxidised?

Answer 3

+2 → +3
+1 change

Fe²⁺ becomes Fe³⁺

Question 4

What is the half equation for the oxidation of Fe²⁺ ions?

Answer 4

Fe²⁺ → Fe³⁺ + e⁻

Question 5

What is the reaction ratio for the oxidation of Fe²⁺ by potassium manganate?

Answer 5

1MnO₄⁻ : 5Fe²⁺

Question 6

What is the equation for the oxidation of Fe²⁺ ions by potassium manganate?

Answer 6

MnO₄⁻ + 5Fe²⁺ + 8H⁺ → Mn²⁺ + 5Fe³⁺ +4H₂O

Question 7

What is the oxidation state change when ethanedioate ions are oxidised?

Answer 7

+3 → +4
+1 change for each carbon

C₂O₄⁻ becomes 2CO₂

Question 8

What is the half equation for the oxidation of ethanedioate ions?

Answer 8

C₂O₄⁻ → 2CO₂ + 2e⁻

Question 9

What is the reaction ratio for the oxidation of ethanedioate ions by potassium manganate?

Answer 9

2MnO₄⁻ : 5C₂O₄⁻

Question 10

What is the equation for the oxidation of ethanedioate ions by potassioum manganate?

Answer 10

2MnO₄⁻ + 5C₂O₄⁻ + 16H⁺ → 2Mn²⁺ + 10CO₂ + 8H₂O

Question 11

The oxidation of ethanedioate ions by potassium manganate is an example of what kind of reaction?

Answer 11

An autocatalytic reaction

(The reaction produces its own catalyst)

Question 12

Which product in the reduction of ethanedioate ions by potassium manganate is the catalyst?

Answer 12

Mn²⁺

Question 13

What are the half equations which explain the autocatalytic reaction of MnO₄⁻ and C₂O₄⁻?

Answer 13

4Mn²⁺ + MnO₄⁻ + 8H⁺ → 5Mn³⁺ + 4H₂O
2Mn³⁺ + C₂O₄⁻ → 2CO₂ + 2Mn²⁺