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Amount concentration and volume

Relate amount concentration and volume with amount = concentration × volume.

Fill two fields and leave the one you want to calculate empty.

n=c×V

Amount

Concentration

Volume

Result—Fill two fields and leave one empty

The relation n = cV

n is amount of substance, usually in mol; c is amount concentration, usually in mol/L; and V is solution volume. The units must be compatible before multiplying or dividing.

Worked example: calculate amount

A solution has c = 0.500 mol/L and V = 250 mL = 0.250 L. Then n = cV = 0.500 × 0.250 = 0.125 mol.

Worked example: calculate volume

You need n = 20 mmol of solute from a c = 0.200 mol/L solution. Convert 20 mmol to 0.020 mol, then V = n/c = 0.020/0.200 = 0.100 L = 100 mL.

Common unit mistake

Do not multiply a concentration in mol/L directly by a volume written in mL in a hand calculation. Convert mL to L first, or deliberately choose a compatible set of units. The calculator handles the listed unit conversions for you.