Uses of chlorine and chlorate(I)AQA A-Level Chemistry: Flashcards

What these 13 flashcards ask

Write the equation for chlorine reacting with water.
What is the oxidation state of chlorine in ClO⁻?
What is a disproportionation reaction?
Why is the reaction of chlorine with water a disproportionation?
What is the name of the ClO⁻ ion?
What reaction occurs between chlorine and water in sunlight?
Why is chlorine used in water treatment?
Give one benefit of chlorinating drinking water.
Give two disadvantages of using chlorine in water treatment.
Why is chlorination of water still considered acceptable?
Write the equation for chlorine with cold, dilute aqueous sodium hydroxide.
Name the bleach formed from chlorine and cold dilute NaOH.
Give two uses of sodium chlorate(I) solution.

Exam questions on Uses of chlorine and chlorate(I)

Chlorine gas is bubbled into water in a laboratory. The pale green solution formed is acidic and has bleaching properties.
Write an equation for the reaction of chlorine with water that forms chloride ions and chlorate(I) ions, and explain why the reaction is a disproportionation.2 marks
A local council treats its drinking water by adding chlorine. A resident complains that chlorine is a poisonous gas and asks why it is added to the water supply.
Explain why the benefit to health of treating drinking water with chlorine is considered to outweigh its toxic effects.2 marks
A swimming pool manager makes a bleach solution by reacting chlorine gas with cold, dilute aqueous sodium hydroxide. She also considers adding chlorine gas directly to the pool water.
Write an equation for the reaction of chlorine with cold, dilute aqueous sodium hydroxide, name the chlorine-containing compound in the solution that acts as the bleach, and state one other use of the solution.3 marks

Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).