Section 2: Calculating the Volume of a Component
If you know the % v/v of a component and the volume of product involved, you can calculate the volume of the component in that volume.
600 ml of Opiate Squill Linctus BP 1988 contains 33 % v/v Squill Oxymel. How much Squill Oxymel is present?
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Ratio Solution
A concentration of 33 % v/v Squill Oxymel means that:
100 ml of Linctus contains 33 ml of Squill Oxymel
Thus: 600 ml of Linctus contains 600 x 33 ml of Squill Oxymel
100
100
600 ml of Linctus contains 198 ml of Squill Oxymel
Equation Solution
The equation you can use is:
% v/v = volume of component x 100 (ml/100 ml)
volume of product
volume of product
which rearranges to:
volume of component = % v/v x volume of product ml
100
100
volume of Squill Oxymel = 33 x 600 ml
100
volume of Squill Oxymel = 198 ml
There is 198 ml of Squill Oxymel present in 600 ml of Linctus.
100
volume of Squill Oxymel = 198 ml
There is 198 ml of Squill Oxymel present in 600 ml of Linctus.