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Question 1 of 3

350 ml of Phenobarbitone Elixir BP 1988 contains 133 ml of ethanol. What is the concentration % v/v of the ethanol?

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% v/v
The concentration of ethanol is 38 % v/v.
EITHER
 % v/v = volume of component x               100                     (ml/100 ml)
volume of product
% v/v Ethanol = 133 x    100         (ml/100 ml)
350
% v/v Ethanol = 38
OR
 350 ml of Elixir contains 133 ml of ethanol
Thus: 100 ml of Elixir contains    100    x 133 ml of ethanol
350
100 ml of Elixir contains 38 ml of ethanol.
Concentration of ethanol is 38 ml/100 ml ie 38 % v/v.

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Question 2 of 3

50 ml of Ammonium Chloride and Morphine Mixture BP 1988 contains 1.5 ml of Chloroform and Morphine Tincture. What is the concentration % v/v of Chloroform and Morphine Tincture in the Mixture?

Type in your answer and PRESS ENTER.
% v/v
The concentration of Chloroform and Morphine Tincture is 3 % v/v.
EITHER
 % v/v = volume of component x               100                     (ml/100 ml)
volume of product
% v/v Chloroform and Morphine Tincture = 1.5 x    100         (ml/100 ml)
50
% v/v Chloroform and Morphine Tincture = 3
OR
 50 ml of Mixture contains 1.5 ml of Chloroform and Morphine Tincture
Thus: 100 ml of Mixture contains    100    x 1.5 ml of Tincture
50
100 ml of Mixture contains 3 ml of Tincture
Concentration of Tincture is 3 ml/100 ml ie 3 % v/v.

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Question 3 of 3

2.5 litres of aqueous ethanol contains 1.75 litres of absolute ethanol. What is the concentration % v/v of ethanol?

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% v/v
The concentration of ethanol is 70 % v/v.
EITHER
Convert litres to millilitres: 2.5 l = 2500 ml; 1.75 l = 1750 ml
% v/v = volume of component x               100                     (ml/100 ml)
volume of product
% v/v Ethanol = 1750 x   100        (ml/100 ml)
2500
% v/v Ethanol = 70
OR
 2500 ml of solution contains 1750 ml of Ethanol
Thus: 100 ml of solution contains    100    x 1750 ml of Ethanol
2500
100 ml of Mixture contains 70 ml of Ethanol
Concentration of Ethanol is 70 ml/100 ml ie 70 % v/v.

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