Section 1: Calculating Percent Volume in Volume
If you know the volume of a component present and the volume of product involved, you can calculate the % v/v of the component.
Compound Rhubarb Mixture contains 75 ml of Compound Rhubarb Tincture in 750 ml of the Mixture. What is the concentration % v/v of the Compound Rhubarb Tincture in the Mixture?
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Ratio
Solution
Solution
You know that 750 ml of the Mixture contains 75 ml of Compound Rhubarb Tincture.
To find the % v/v you need to find how much Compound Rhubarb Tincture 100 ml of Mixture contains.
By ratios:
750 ml of Mixture contains 75 ml of Tincture. Thus:
100 ml of Mixture contains 100 x 75 ml of Tincture
750
750 ml of Mixture contains 75 ml of Tincture. Thus:
100 ml of Mixture contains 100 x 75 ml of Tincture
750
100 ml of Mixture contains 10 ml of Tincture
The concentration of Tincture is 10 ml/100 ml ie 10 % v/v
The concentration of Tincture is 10 ml/100 ml ie 10 % v/v
Equation Solution
The equation you can use is:
% v/v = volume of component x 100 (ml/100 ml)
volume of product
volume of product
% v/v Tincture = 75 x 100 ml/100 ml
750
750
% v/v Tincture = 10 ml/100 ml
The concentration of Compound Rhubarb Tincture
is 10 ml/100 ml ie 10 % v/v.
The concentration of Compound Rhubarb Tincture
is 10 ml/100 ml ie 10 % v/v.