ChemistryGCSE & IGCSEConcentration & Solutions

Concentration (g/dm³) formula

The concentration (g/dm³) formula as it is used in GCSE Chemistry, taken from the GCSE Chemistry formula sheet.

The formula

\text{conc (g/dm}^3) = c \times M_r

Write the formula down before substituting — most mark schemes award a method mark for a correct, clearly quoted formula.
Check every quantity is in consistent units before you substitute, then substitute in one step so the working stays easy to follow.
Show the rearrangement rather than jumping to the answer, and give the final value to the accuracy the question asks for.

c = \dfrac{n}{V}

\dfrac{c_A V_A}{c_B V_B} = \dfrac{\text{moles } A}{\text{moles } B}

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