Photo AI
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
a) (i) What are the hazards associated with potassium manganate(VII)?
Answer
Potassium manganate(VII) is classified as oxidising, harmful and hazardous to the environment. This means it can promote or intensify the burning of combustible materials, may cause harm if it comes into contact with skin or is ingested, and poses risks to the surrounding ecosystem.
Step 2
a) (ii) Explain one precaution that should be taken when preparing the sample of chlorine gas,
Answer
One precaution that should be taken is to use a fume cupboard. This will ensure that any chlorine gas produced is contained and does not escape into the laboratory environment, thereby minimizing exposure to this toxic gas.
Step 3
Step 4
Step 5
d) In the reaction, potassium manganate(VII), KMnO4, reacts with hydrochloric acid to form manganese chloride, MnCl2, potassium chloride, and water.
Answer
The balanced chemical reaction can be stated as follows:
ightarrow 2 MnCl_2 + 2 KCl + 8 H_2O + 5 Cl_2 $$ This shows the stoichiometric relationship between the reactants and the products, confirming the formation of manganese chloride, potassium chloride, and water, along with chlorine gas.