3.2.3.2 Uses of chlorine and chlorate(I)

Question 1

What is the reaction of Water and Chlorine?

Answer 1

Cl2 + H2O –> 2H+ + Cl- + ClO-

ClO- (Chlorate (I) ion)

Question 2

What type of reaction is the reaction with Water and Chlorine?

Answer 2

Disproportionation reaction

Question 3

What reaction occurs in sunlight between Chlorine and Water?

Answer 3

Decomposition of water to form chlorine and oxygen
Cl2 + H2O –> <– 1/2O2 + 2H+ + 2CL-

Question 4

Why is water treated?

Answer 4

• Chlorate (I) ions kill bacteria therefore by adding these ions to the water it makes it safe to drink

Question 5

What are the advantages to treating water?

Answer 5

• No harmful bacteria in it
• No bad tastes
• Removes all discolouration

Question 6

What are the disadvantages to treating water?

Answer 6

• Cl2 gas is toxic when breathed in
• Cl2 liquid causes severe chemical burns
• Water combines with organic compounds and chlorinated hydrocarbons are all carcinogens

Question 7

What is the reaction between chlorine and NaOH?

Answer 7

2NaOH(aq) + Cl2(g) –> <– NaClO(aq)+ NaCl(aq) + H2O(l)

Question 8

What are the conditions to form bleach?

Answer 8

Cold, Dilute NaOH with Cl gas at room temperature
Chlorine is disproportionated