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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) Hazard Symbols
Answer
The hazard symbol for concentrated hydrochloric acid is depicted as a corrosive material, potent enough to cause severe burns upon contact. The symbol for potassium manganate(VII) indicates that it is an oxidizing agent, which presents a fire hazard and is harmful if ingested or inhaled. The hazard symbol for chlorine gas represents a toxic substance that can cause respiratory issues and irritation to the skin and eyes.
Step 2
a(ii) Purpose of the Setup
Answer
Chlorine gas is generated in the setup, and a moist blue litmus paper is used to test the gas. Chlorine gas reacts with the moisture on the litmus paper, turning it white due to bleaching, which indicates the presence of chlorine. This method is essential for detecting chlorine because it allows for a visual confirmation of the gas's presence.