Question detail
If 2.5 g of sodium chloride (NaCl) is dissolved in enough water to make 500 cm3 of solution, what is the concentration of the solution in mol/dm3? (Mr of NaCl = 58.5 g/mol)
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At a glance
Question
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Topic
Using concentrations of solutions in mol/dm3 (chemistry only) (HT only)
Question
If 2.5 g of sodium chloride (NaCl) is dissolved in enough water to make 500 cm3 of solution, what is the concentration of the solution in mol/dm3? (Mr of NaCl = 58.5 g/mol)
Answer
0.085 mol/dm3
Explanation
This question assesses the ability to calculate concentration from mass and volume. It requires converting grams to moles using the molar mass and then calculating concentration in mol/dm3.
Common mistake
Incorrect Use of Volume Units
Students often forget to convert volumes from cm3 to dm3 when calculating concentration in mol/dm3.
Always convert cm3 to dm3 by dividing the volume in cm3 by 1000 before using it in concentration calculations.
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