Question detail
For Soluble salts, which reaction focus answer best supports this Unit 4.4 objective: Explain why the insoluble solid is added in excess when preparing a soluble salt?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Reactions of acids
Question
- A. To ensure all the acid reacts - correct reaction focus for soluble salt
- B. Wrong reaction focus: confuses soluble salt with a nearby Unit 4.4 chemical change idea
- C. Wrong particle check: uses the wrong ion, electrode, acid-base term, or product for Soluble salts
- D. Wrong reaction link: does not support Explain why the insoluble solid is added in excess when preparing a soluble salt
Answer
The correct option is To ensure all the acid reacts - correct reaction focus for soluble salt.
Explanation
The correct option is To ensure all the acid reacts - correct reaction focus for soluble salt. To ensure all the acid reacts - correct reaction focus for soluble salt is correct because it directly supports the approved learning objective to explain why the insoluble solid is added in excess when preparing a soluble salt. This reaction focus variant asks students to separate soluble salt from similar Unit 4.4 chemical-change ideas. The reasoning belongs to Soluble salts within Reactions of acids, so it should not be confused with nearby ideas about acids, alkalis, bases, oxidation, reduction, displacement, reactivity, electrolysis, electrodes, ions, pH, or salt preparation unless those are named in the objective. Use the focus term soluble salt to keep the answer aligned with AQA GCSE Chemistry 8462 Unit 4.4 Chemical changes. Keep acid, alkali and base distinct; keep oxidation and reduction distinct; do not mix reduction with displacement; keep electrolysis separate from electroplating; distinguish anode from cathode, positive ions from negative ions, oxidation state from ionic charge, and strong acid from concentrated acid. The other options are weaker because they either use the wrong reaction type, wrong ion, wrong electrode, wrong acid-base distinction, vague wording, or the wrong chemical-change context.
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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