Disproportination

Question 1

What is meant by disproportionation

Answer 1

The simultaneous oxidation and reduction of the same element

Question 2

How do we synthesise bleach NaClO

Answer 2

Bubble chlorine gas with cold dilute aqueous NaOH to make sodium chlorate (1)

Question 3

What’s the balanced equation for bleach

Answer 3

Cl2 + NaOH - NaClO + NaCl + H20

Question 4

What’s the ionic equation to synthesise bleach

Answer 4

Cl2 + h20 ———- clo- + cl- + H+

Question 5

Chlorine can be used to clean water . Give the equation for the formation of HCLO

Answer 5

Cl2 + H2O ——— HCLO + HCL

Question 6

What’s the dissociation of HCLO

Answer 6

HCLO —— H+ + CLO-
CLO- acts as an antibacterial

Question 7

Two advantages of chlorination of water

Answer 7

Kills microorganisms
Prevents growth of algae

Question 8

What are three disadvantages of chlorination of water

Answer 8

Can be toxic
Causes burns
Forms chlorinated hydrocarbons

Question 9

Suggest two alternatives to chlorination of water

Answer 9

O3 (ozone) - kills microorganisms , however is expensive with a short half life
UV - kills microorganisms , however only for a short amount of time