Question detail
Describe the role of ions in the electrolysis of aqueous solutions and explain why water contributes to the process.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Electrolysis
Question
Describe the role of ions in the electrolysis of aqueous solutions and explain why water contributes to the process.
Answer
In the electrolysis of aqueous solutions, ions from the ionic compound and ions from water (hydrogen and hydroxide ions) are present. Water contributes to the process by providing additional ions that can be discharged at the electrodes, influencing the products formed during electrolysis.
Explanation
This question assesses the student's understanding of the composition of aqueous solutions and the significance of water in the electrolysis process. It requires them to explain the interaction between different ions during electrolysis.
Common mistake
Misunderstanding Reactivity Series
Students often confuse the reactivity series and incorrectly predict the products of aqueous electrolysis, thinking that the metal will always be produced at the cathode regardless of its reactivity compared to hydrogen.
To fix this, students should remember that if the metal is more reactive than hydrogen, hydrogen will be produced at the cathode instead. Reviewing the reactivity series and practicing predictions based on it can help reinforce this concept.
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