Question detail
What is the purpose of adding an excess of insoluble solid when preparing a soluble salt from an acid?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Reactions of acids
Question
What is the purpose of adding an excess of insoluble solid when preparing a soluble salt from an acid?
Answer
Adding an excess of insoluble solid ensures that all the acid reacts completely, allowing for maximum salt production. The excess solid can then be removed by filtration, leaving a pure solution of the soluble salt.
Explanation
This question assesses the student's understanding of the rationale behind using excess reactants in chemical preparations. A strong answer shows comprehension of reaction completeness and purification techniques.
Common mistake
Misunderstanding Filtration Purpose
Students often think that filtration is used to separate the acid from the insoluble solid instead of understanding that it is used to remove the excess insoluble solid from the solution.
Emphasize that filtration is specifically for separating the unreacted solid from the solution containing the soluble salt.
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