Reversing the calculations
2 marks · HardA solution contains 0.00500 mol of a substance at a concentration of 0.250 mol/dm³.
Calculate the volume of this solution, in cm³, required to provide 0.00500 mol of the substance.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
20.0 cm³ (±0.1)
Also accept: Shows working using dm³ before conversion
Common mistakes: Fails to convert to cm³; Incorrect rearrangement (divides by moles instead of concentration)
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Marking points
M1 · 1 mark · Correctly rearranges concentration = moles/volume to give volume = moles/concentration and substitutes the values.
A1 · 1 mark · Gives final answer as 0.0200 dm³ or 20.0 cm³ with correct working and unit. (follow-through)
Worked solution
Volume (dm³) = moles / concentration =
Convert to cm³: