Chlorine gas can be prepared by reacting concentrated hydrochloric acid with solid potassium manganate(VII) - Edexcel - GCSE Chemistry - Question 6 - 2023 - Paper 2
Question 6
Chlorine gas can be prepared by reacting concentrated hydrochloric acid with solid potassium manganate(VII).
Figure 10 shows the apparatus used.
Figure 11 shows th... show full transcript
Worked Solution & Example Answer:Chlorine gas can be prepared by reacting concentrated hydrochloric acid with solid potassium manganate(VII) - Edexcel - GCSE Chemistry - Question 6 - 2023 - Paper 2
Step 1
What are the hazards associated with potassium manganate(VII)?
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Answer
The hazards associated with potassium manganate(VII) include that it is oxidising and harmful to the environment. It can cause environmental damage and may be toxic when propagated into ecosystems.
Step 2
Explain one precaution that should be taken when preparing the sample of chlorine gas.
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Answer
One precaution is to use a fume cupboard. This is important because chlorine is a toxic gas that can be harmful if inhaled, so working within a controlled environment minimizes exposure.
Step 3
State the purpose of the delivery tube.
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The purpose of the delivery tube is to deliver substances (gas/chlorine) from the flask to the gas jar without allowing gas to escape into the surroundings.
Step 4
Suggest why damp blue litmus is placed at the top of the gas jar.
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Damp blue litmus paper is placed at the top of the gas jar to test for the presence of chlorine gas. Chlorine is a gas that turns damp blue litmus paper red, indicating its acidic nature.
