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Chemistry - Topic 04: Inorganic Chemistry and the Periodic Table > 4.23 - Reactions of Halides with Sulfuric Acid > Flashcards

4.23 - Reactions of Halides with Sulfuric Acid Flashcards

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1
Q

What is the trend in oxidising power for halogens?

A

Decreases down the group

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2
Q

What is the trend in reducing power for halogens?

A

Increases down the group

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3
Q

What is the general half-equation for the reducing action of halide ions?

A

2X- -> X2 + 2e-

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4
Q

What is the equation for the partial ionisation of sulfuric acid?

A

H2SO4 H+ + HSO4-

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5
Q

Where does the position of equilibrium lie in this scenario?

A

Far to the right

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6
Q

Other than an acid, what can sulfuric acid act as?

A

An oxidising agent

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7
Q

What are three possible reduction products of sulfuric acid?

A

Sulfur dioxide, sulfur and hydrogen sulfide

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8
Q

What is the half equation for sulfuric acid becoming sulfur dioxide?

A

H2SO4 + 2H+ + 2e- -> 2H2O + SO2

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9
Q

What is the change in oxidation number here?

A

+6 to +4

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10
Q

What is the half equation for sulfuric acid becoming sulfur?

A

H2SO4 + 6H+ + 6e- -> 4H2O + S

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11
Q

What is the change in oxidation number here?

A

+6 to 0

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12
Q

What is the half equation for sulfuric acid becoming hydrogen sulfide?

A

H2SO4 + 8H+ + 8e- -> 4H2O + H2S

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13
Q

What is the change in oxidation number here?

A

+6 to -2

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14
Q

What is observed when sulfuric acid is added to NaCl?

A

Misty fumes

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15
Q

What is observed when sulfuric acid is added to NaBr?

A

Misty fumes, brown fumes and a colourless gas with a choking smell

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16
Q

What is observed when sulfuric acid is added to NaI?

A

Misty fumes, purple fumes or black solid, colourless gas with choking smell, yellow solid and colourless gas with rotten egg smell

17
Q

What is responsible for misty fumes?

A

The hydrogen halide formed

18
Q

What is responsible for brown fumes?

A

Bromine gas

19
Q

What is responsible for a colourless gas with a choking smell?

A

Sulfur dioxide

20
Q

What is responsible for purple fumes or black solid?

A

Iodine

21
Q

What is the yellow solid?

A

Sulfur

22
Q

What is responsible for the rotten egg smell?

A

Hydrogen sulfide

Chemistry - Topic 04: Inorganic Chemistry and the Periodic Table (9 decks)

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