Chemistry In Industry (The Contact Process, Electrolysis Of Brine)

Question 1

Step 1. Sulfur is oxidised

Sulfur + Oxygen –>

Answer 1

Sulfur dioxide

Question 2

Step 2. Sulfur dioxide is oxidised

Sulfur dioxide + Oxygen –>

Answer 2

Sulfur Trioxide

Question 3

Step 3. Sulfur trioxide is dissolved in concentrated sulfuric acid
Sulfur trioxide + Sulfuric acid –>

Answer 3

Oleum

Question 4

Oleum is diluted with measure amount of water

Oleum + Water –>

Answer 4

Concentrated sulfuric acid

Question 5

Step 1 equation:

Answer 5

Sulfur + Oxygen –> Sulfur dioxide

S + O2 –> SO2

Question 6

Step 2 equation:

Answer 6

Sulfur dioxide + Oxygen –> Sulfur trioxide

2SO2 + O2 –> 2SO3

Question 7

Step 3 equation:

Answer 7

Sulfur trioxide + sulfuric acid –> Oleum

SO3 + H2SO4 –> H2S2O7

Question 8

Step 4 equation:

Answer 8

Oleum + water –> Concentrated sulfuric acid

H2S2O7 + H2O –> 2H2SO4

Question 9

Oleum equation

Answer 9

H2S2O7

Question 10

Sulfuric acid

Answer 10

2H2SO4

Question 11

Conditions for the contact process:
Temperature:
Pressure:
Catalyst:

Answer 11

Temperature: 450C
Pressure: 2 atmospheres
Catalyst: Vanadium oxide (V2O5)

Question 12

Uses of sulfuric acid

Answer 12

Fertilisers
Detergents
Paints

Question 13

Concentrated brine is electrolysed industrially using a ____________ cell

Answer 13

Diaphragm

Question 14

What is in brine

Answer 14

Sodium chloride

Question 15

What three products are produced from the electrolysis of brine

Answer 15

Hydrogen gas
Chlorine gas
Sodium hydroxide

Question 16

Chlorine gas is given off at the _________

Answer 16

Anode

Question 17

Hydrogen gas is given off at the _________

Answer 17

Cathode

Question 18

The sodium ions stay in the solution and the hydroxide ions from the water are also left behind. What does this mean

Answer 18

Sodium hydroxide solution is left in the solution

Question 19

Half equation at the cathode

Answer 19

2H+ + 2e- –> H2

Question 20

Half equation at the anode

Answer 20

2Cl- –> Cl2 + 2e-

Question 21

Useful products from the electrolysis of brine and their uses

Answer 21

Chlorine - Sterilising water supplies. Bleach.
Hydrogen - Used in the haber process
Sodium hydroxide - Soap, bleach

Question 22

Use of chlorine

Answer 22

Sterilising water supplies. Bleach

Question 23

Use of Hydrogen

Answer 23

Used in the haber process

Question 24

Use of sodium hydroxide

Answer 24

Soap, bleach