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Inorganic Chemistry > Potassium permanganate > Flashcards

Potassium permanganate Flashcards

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1
Q

Chemical Formula

A

KMnO4

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2
Q

Common Name

A

Chemical Chameleon
Candy’s Crystal

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3
Q

What is a Potassium permanganate?

A

Oxidizing agent with
disinfectant, deodorising, and
astringent properties.

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4
Q

Procedure in preparing Potassium permanganate

A

Prepare a 1:15,000 solution of potassium permanganate using recently boiled distilled water. (30ml)

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5
Q

Identification Test

A

Baeyer Test

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6
Q

What is Baeyer’s test?

A

A potassium permanganate (KMnO4) solution is a test for unsaturation (alkenes and alkynes) or functional groups that can be oxidized.

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7
Q

What color is a permanganate (MnO4)?

A

Deep Purple

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8
Q

What happens to MnO4 upon reduction with Potassium Permanganate solution?

A

It’s color converts to brown precipitate (MnO2)

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9
Q

Safety Measures

A
  1. Avoid skin contact
  2. Wear protective gloves and clothing.
  3. Safety equipment suppliers/manufacturers can provide recommendations on the most protective glove/clothing material for your operation.
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10
Q

When potassium permanganate is dissolved in concentrated sulphuric acid what is formed?

A

A highly explosive substance is formed (Mn2O7) Manganese heptoxide.

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11
Q

KMnO4 + H2SO4
Potassium permanganate + sulphuric acid

In dept

A
  1. Mn₂O7 further changes to MnO₂
  2. oxidation state of manganese and oxygen changes.
  3. Concentrated H2SO4 will dehydrate
  4. KMnO4 to give Mn2O7 which is explosive giving
    off O2
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12
Q

H2SO4 + 2KMnO4 =

A

K2SO4 + Mn2O7 + H2O

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13
Q

2Mn2O7 =

A

4MnO2 + 3O2

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14
Q

KMnO4
+ H2O2

Potassium Permanganate + Hydrogen Peroxide

A

Equation
3H2O2 + 2KMnO4 →
3O2 + 2MnO2 + 2KOH + 2H2O

One of the products of this reaction, MnO2, also serves as a catalyst for the decomposition of hydrogen peroxide.

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15
Q

KMNO4 + KI+ H2SO4

Potassium permanganate, Potassium Iodide
Sulphuric acid

A

2 KMnO4 (aq) + 10 KI (aq)
+ 8 H2SO4 (aq) → 2 MnSO4 (aq) + 6 K2SO4 (aq) + 5 I2 (s) + 8 H2O (l)

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16
Q

Chemical Properties of Potassium permanganate

A
  • purple to magenta crystalline solid
  • odorless
  • soluble in water, acetone,
    acetic acid, methanol, and
    pyridine
    -gets dissolved in ethanol and
    organic solvents.
  • Potassium permanganate occurs in the form of monoclinic prisms, almost opaque with a blue metallic lustre.
17
Q

Uses of Potassium permanganate

A
  1. used in the chemical industry and laboratories as a strong oxidizing agent
  2. also as a medication for
    dermatitis, for cleaning wounds, and general disinfection.
  3. It is on the World Health
    Organization’s List of Essential Medicines.

Inorganic Chemistry (7 decks)

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