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An aqueous solution of concentrated sodium chloride is electrolysed - OCR Gateway - GCSE Chemistry - Question 11 - 2020 - Paper 1
Question 11
An aqueous solution of concentrated sodium chloride is electrolysed. Bubbles are seen at the positive electrode. What is the name of the substance produced at the p... show full transcript
Worked Solution & Example Answer:An aqueous solution of concentrated sodium chloride is electrolysed - OCR Gateway - GCSE Chemistry - Question 11 - 2020 - Paper 1
Step 1
What is the name of the substance produced at the positive electrode?
Answer
During the electrolysis of concentrated sodium chloride (NaCl) solution, the positive electrode (anode) attracts the negative ions, which are chloride ions (Cl⁻). At the anode, these ions are oxidized to form chlorine gas (Cl₂). Therefore, the substance produced at the positive electrode is chlorine.