Question detail
A solution contains 5 grams of sodium chloride (NaCl) dissolved in 0.25 dm3 of water. Calculate the concentration of the solution in mol/dm3.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Using concentrations of solutions in mol/dm3 (chemistry only) (HT only)
Question
A solution contains 5 grams of sodium chloride (NaCl) dissolved in 0.25 dm3 of water. Calculate the concentration of the solution in mol/dm3.
Answer
The answer is 0.34 g.
Explanation
This uses Concentration in g/dm3 because the objective is about (chemistry only) (HT only) Explain how concentration in mol/dm3 is related to mass of solute and volume of solution. The reasoning belongs to Concentrations in mol/dm3 and titration calculations within Using concentrations of solutions in mol/dm3 (chemistry only) (HT only), so it should not be confused with nearby quantitative ideas such as mass, moles, concentration, yield, atom economy, or gas volume unless those are named in the objective. Use the focus term chemistry only to keep the answer aligned with AQA GCSE Chemistry 8462 Unit 4.3.
Common mistake
Misunderstanding Concentration Relationships
Students often confuse the relationship between concentration, mass of solute, and volume of solution, thinking that concentration is solely dependent on mass without considering volume.
To fix this, remember that concentration in mol/dm3 is calculated by dividing the mass of solute (in grams) by the volume of solution (in dm3). Always consider both mass and volume when discussing concentration. Keep the correction anchored to Concentrations in mol/dm3 and titration calculations; check formula, substitution, calculation, final answer, and unit where relevant.
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