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Chlorine gas can be prepared by reacting concentrated hydrochloric acid with solid potassium manganate(VII) - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2023 - Paper 2
Question 4
Chlorine gas can be prepared by reacting concentrated hydrochloric acid with solid potassium manganate(VII). Figure 6 shows the apparatus used. (a) Figure 7 shows ... 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 Combined Science - Question 4 - 2023 - Paper 2
Step 1
a(i) Identify the hazard symbols.
Answer
The hazard symbols for the substances are as follows:
- Concentrated Hydrochloric Acid: This substance is represented by the symbol indicating it is corrosive.
- Potassium Manganate(VII): This is indicated by the symbol that represents environmental hazards and can be harmful.
- Chlorine Gas: The hazard symbol for chlorine gas highlights that it is toxic and harmful to health.
Step 2
a(ii) Explain the role of chlorine in the reaction.
Answer
Chlorine plays a crucial role in this reaction as it is the product generated when concentrated hydrochloric acid reacts with solid potassium manganate(VII). When chlorine gas is produced, it will turn damp litmus paper from blue to red, indicating its acidic nature. This reaction also suggests that chlorine can bleach the litmus paper, which turns white, thereby demonstrating its reactive properties.