uses of chlorine and chlorate

Question 1

What are chlorines main uses?

Answer 1

to purify water and kill bacteria in swimming pools

Question 2

what is the equation for adding chlorine to water?

Answer 2

Cl2 + H2O HClO + HCl

chloric acid + hydrochloric acid

Question 3

What are the oxidation states and what type of reaction is it when adding chlorine and water?

Answer 3

Cl2 + H2O HClO + HCl
0. +1. -1
a disproportionation reaction as the chlorine is reduced and oxidised at

Question 4

If you add universal indicator paper to chlorine water, what colour changes would there be?

Answer 4

It would change from green (neutral) to red (acidic) as chloric acid and hydrochloric acid lower the PH of the solution. it would then get bleached and turn white as chlorine contains a bleaching agent

Question 5

Why is chlorine frequently added to swimming pool water?

Equation?

Answer 5

To kill bacteria by oxidation that can cause life-threatening diseases
2Cl2 + 2H2O –> 4HCl + O2 (only happens in sunlight)

Question 6

Why is it important to use a minimal amount of chlorine?

Answer 6

it is toxic

Question 7

What is the name of the chemical that can be added to swimming pool water as an alternative to direct chlorination?
equation?

Answer 7

sodium/calcium chlorate or sodium hypochlorite

NaClO + H2O –> Na+ + OH- + HClO

Question 8

why do swimming pools operate in slightly acidic conditions?

Answer 8

adding H+ ions removes the OH- ions and shifts the equilibrium to the right which increases the amount of HClO produced

Question 9

give the equation and what type of reaction is it between chlorine and bleach?

Answer 9

Cl2 + NaOH –> NaCl + NaClO + H2O

- disproportionation of chlorine