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Question 1 of 3

What volume of Chloroform and Morphine Tincture is in 700 ml of Ammonium Chloride and Morphine Mixture BP 1988 containing 3 % v/v Chloroform and Morphine Tincture?

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ml
There are 21 ml of Chloroform and Morphine Tincture.
EITHER
 volume of component = % v/v x volume of product    ml
100
volume of Chloroform and Morphine Tincture = 3 x    700      ml
100
volume of Chloroform and Morphine Tincture = 21 ml
OR
 3 % v/v Chloroform and Morphine Tincture means that:
100 ml of Mixture contains 3 ml of Tincture
Thus: 700 ml of Mixture contains    700    x 3 ml of Tincture
100
700 ml of Mixture contains 21 ml of Tincture

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Question 2 of 3

A man drops 0.25 ml of eye drops into his eyes. If the eye drops contain 13 % v/v Distilled Witch Hazel, how many microlitres of Distilled Witch Hazel did the man drop on his eyes?

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µl
The man dropped 32.5 microlitres of Distilled Witch Hazel on his eyes.

EITHER
 volume of component = % v/v x volume of product    ml
100
volume of Distilled Witch Hazel = 13 x   0.25     ml
100
volume of Distilled Witch Hazel = 0.0325 ml = 1000 x 0.0325 µl = 32.5 µl
OR
 13 % v/v Distilled Witch Hazel means that:
100 ml of eye drops contains 13 ml of Witch Hazel
Thus: 0.25 ml of eye drops contains    0.25    x 13 ml of Witch Hazel
100
0.25 ml of eye drops contains 0.0325 ml = 1000 x 0.0325 µl = 32.5 µl Witch Hazel

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Question 3 of 3

You need to prepare 32 ml of an aqueous solution containing 40 % v/v ethanol. How many ml of absolute ethanol do you need?

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ml
You need 12.8 ml of absolute ethanol.
EITHER
 volume of component = % v/v x volume of product    ml
100
volume of absolute ethanol = 40 x    32      ml
100
volume of absolute ethanol = 12.8 ml
OR
 40 % v/v ethanol means that:
100 ml of solution contains 40 ml of absolute ethanol
Thus: 32 ml of solution contains    32    x 40 ml of absolute ethanol
100
32 ml of solution contains 12.8 ml of absolute ethanol

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