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Question 1 of 3

A volume of Opiate Squill Linctus BP 1988 contains 66 ml of Camphorated Opium Tincture at a concentration of 33 % v/v. What is the volume of the Linctus?

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ml
The volume of Linctus is 200 ml.
EITHER
 volume of product = volume of component x     100     ml
% v/v
volume of Linctus = 66 x    100    ml
33
mass of Linctus =200 ml
OR
 33 % w/w Camphorated Opium Tincture means that there are
33 ml of Tincture in 100 ml of Linctus
Thus: 66 ml of Tincture are in    66    x 100 ml of Linctus
33
66 ml of Tincture are in 200 ml of Linctus

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Question 2 of 3

A pharmacist prepares a solution containing 40 % v/v ethanol. If the solution contains 35 ml of absolute ethanol, up to what volume did the pharmacist make the final solution?

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ml
The volume was made up to 87.5 ml.
EITHER
 volume of product = volume of component x     100     ml
% v/v
volume of solution = 35 x    100    ml
40
volume of solution = 87.5 ml
OR
 40 % w/w ethanol means that there are
40 ml of absolute ethanol in 100 ml of solution
Thus: 35 ml of absolute ethanol are in    35    x 100 ml of solution
40
35 ml of absolute ethanol are in 87.5 ml of solution

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Question 3 of 3

Compound Rhubarb Mixture BP 1988 contains 10 % v/v Compound Rhubarb Tincture. 70 ml of Compound Rhubarb Tincture are used to make some Mixture: how much Mixture is made?

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ml
700 ml of Mixture are made.
EITHER
 volume of product = volume of component x     100     ml
% v/v
volume of Mixture = 70 x    100    ml
10
volume of Mixture = 700 ml
OR
 10 % v/v Compound Rhubarb Tincture means that there are
10 ml of Tincture in 100 ml of Mixture
Thus: 70 ml of Tincture are in    70    x 100 ml of Mixture
10
70 ml of Tincture are in 700 ml of Mixture

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