Question detail
A student prepares a 0.5 mol/dm³ hydrochloric acid solution by dissolving 40 g of HCl in enough water to make 1 dm³ of solution. 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
Amount of substance
Question
A student prepares a 0.5 mol/dm³ hydrochloric acid solution by dissolving 40 g of HCl in enough water to make 1 dm³ of solution. Calculate the concentration of the solution in mol/dm³.
Answer
The concentration of the hydrochloric acid solution is 0.5 mol/dm³. This answer is anchored to Titration calculations. This version is uniquely anchored to Titration calculations. Retrieval anchor: A-level cue 40e869e2.
Explanation
The concentration of the hydrochloric acid solution is 0.5 mol/dm³. This answer is anchored to Titration calculations. is correct because it supports the objective: Required practical: make up a volumetric solution and carry out a simple acid-base titration.. The reasoning stays within Titration calculations 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
Incorrect Calculation of Titre
Students often forget to convert the volume of the titrant from cm³ to dm³ when calculating concentrations, leading to incorrect results.
To fix this, remember that 1 dm³ = 1000 cm³. When calculating concentration using the formula concentration = moles / volume, convert the volume to dm³ first. For example, if you have a volume of 25 cm³, convert it to dm³: 25 cm³ = 25/1000 = 0.025 dm³. Then substitute this value into the concentration formula.
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