Molar concentration

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Molar concentration is a measure of the concentration of a solution. It is defined as moles of solute per litre of solvent, and has units of mol dm-3.

C=\frac{N/A}{V}

Here, N is the number of molecules present in the volume. This latter is measured in litres. A is the Avogadro's number, 6.023 1023

[edit] Examples

Most proteins are present in the bacteria E.Coli at 60 copies or fewer. The volume of the bacteria is 10-15 litre, which gives us C=10-7 M =100nM. (nM is nanomolar i.e. 10-9).

2 grams of NaCl dissolved in 5mL of Water. As 58 grams of NaCl is 1 A molecules, and 1mL is 0.001 litre, this gives C=(2/58)/0.005=6.9 M.

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