Question detail
Why is an insoluble solid added in excess 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
Why is an insoluble solid added in excess when preparing a soluble salt from an acid?
Answer
An insoluble solid is added in excess to ensure that all the acid reacts completely. This allows for the maximum amount of soluble salt to be produced, as any unreacted acid can be removed by filtration.
Explanation
This question tests the understanding of the preparation of soluble salts and the role of excess reactants in chemical reactions. The answer highlights the importance of ensuring complete reaction and the practical steps involved in the process.
Common mistake
Excess Solid Misunderstanding
Students often think that adding an insoluble solid in excess is to ensure all the acid reacts, rather than to ensure that the solution is saturated and all the acid is neutralised.
Emphasize that the excess solid ensures that any unreacted acid is neutralised, and the remaining solid can be filtered out, leaving a pure salt solution.
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