Manganate equations Flashcards

1
Q

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

MnO₄⁻ ions are reduced

A

+7 → +2
-5 change

MnO₄⁻ becomes Mn²⁺

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2
Q

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

MnO₄⁻ ions are reduced

A

MnO₄⁻ + 5e⁻ + 8H⁺ → Mn²⁺ + 4H₂O

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3
Q

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

A

+2 → +3
+1 change

Fe²⁺ becomes Fe³⁺

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4
Q

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

A

Fe²⁺ → Fe³⁺ + e⁻

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5
Q

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

A

1MnO₄⁻ : 5Fe²⁺

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6
Q

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

A

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

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7
Q

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

A

+3 → +4
+1 change for each carbon

C₂O₄⁻ becomes 2CO₂

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8
Q

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

A

C₂O₄⁻ → 2CO₂ + 2e⁻

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9
Q

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

A

2MnO₄⁻ : 5C₂O₄⁻

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10
Q

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

A

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

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11
Q

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

A

An autocatalytic reaction

(The reaction produces its own catalyst)

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12
Q

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

A

Mn²⁺

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13
Q

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

A

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

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