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Strontium metal can be obtained by the electrolysis of molten strontium bromide, SrBr₂, using the apparatus shown in the diagram - CIE - A-Level Chemistry - Question 17 - 2010 - Paper 1
Question 17
Strontium metal can be obtained by the electrolysis of molten strontium bromide, SrBr₂, using the apparatus shown in the diagram. Why is an atmosphere of argon used... show full transcript
Worked Solution & Example Answer:Strontium metal can be obtained by the electrolysis of molten strontium bromide, SrBr₂, using the apparatus shown in the diagram - CIE - A-Level Chemistry - Question 17 - 2010 - Paper 1
Step 1
Why is an atmosphere of argon used around the cathode?
Answer
The use of argon in the electrolysis process is crucial because it provides an inert atmosphere that prevents the formation of unwanted compounds. Argon does not react with strontium, ensuring that pure strontium metal is obtained without contamination. If argon were not present, oxygen from the air could react with the molten strontium, leading to the formation of strontium oxide, which is not desired in this process. Therefore, the correct answer is D: Without the argon, strontium oxide would form in the air.