Question detail
A solution contains 10 g of sodium chloride (NaCl) dissolved in 250 cm³ of water. Calculate the concentration of the solution in g/dm³.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
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exam_style
Style
Topic
Mathematical requirements and assessment objectives
Question
A solution contains 10 g of sodium chloride (NaCl) dissolved in 250 cm³ of water. Calculate the concentration of the solution in g/dm³.
Answer
The concentration of the solution is 40 g/dm³. This answer is anchored to Assessment objectives and paper structure. This version is uniquely anchored to Assessment objectives and paper structure. Retrieval anchor: A-level cue c0563a44.
Explanation
The concentration of the solution is 40 g/dm³. This answer is anchored to Assessment objectives and paper structure. is correct because it supports the objective: Apply knowledge and understanding in theoretical, practical, qualitative and quantitative contexts.. The reasoning stays within Assessment objectives and paper structure and avoids drifting into a similar A-Level Chemistry idea. This item is treated as conceptual revision rather than a formal calculation item because the validated answer is an explanation or option choice, not a worked numerical response.
Common mistake
Misidentifying the role of the catalyst in a reaction
Students often think a catalyst is consumed during the reaction and therefore must be added in stoichiometric amounts.
Explain that a catalyst is not consumed; it only provides an alternative reaction pathway and is present in the same amount before and after the reaction. It should be added in catalytic (small) amounts and can be recovered and reused.
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