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Question 1 of 9

Opiate Squill Linctus BP 1988 contains 33 % v/v Squill Oxymel. If 132 ml of Squill Oxymel were used in a preparation of the Linctus, how much Linctus was made?

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ml
400 ml of Linctus was made.
EITHER
 volume of product = volume of component x     100     ml
% v/v
volume of Linctus = 132 x    100    ml
33
volume of Linctus = 400 ml
OR
 33 % v/v Squill Oxymel means that there are
33 ml of Squill Oxymel in 100 ml of Linctus
Thus: 132 ml of Squill Oxymel are in    132    x 100 ml of Linctus
33
132 ml of Squill Oxymel are in 400 ml of Linctus

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Question 2 of 9

550 ml of Liquid Paraffin and Magnesium Hydroxide Oral Emulsion BP 1988 contains 137.5 ml of Liquid Paraffin. What is the concentration % v/v of the Liquid Paraffin?

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% v/v
The concentration of Liquid Paraffin is 25 % v/v.

EITHER
 % v/v = volume of component x             100                 (ml/100 ml)
volume of product
% v/v Liquid Paraffin = 137.5 x    100        (ml/100 ml)
550
% v/v Liquid Paraffin = 25
OR
 550 ml of Emulsion contains 137.5 ml of Liquid Paraffin
Thus: 100 ml of Emulsion contains    100    x 137.5 ml of Liquid Paraffin
550
100 ml of Emulsion contains 25 ml of ethanol.
Concentration of Liquid Paraffin is 25 ml/100 ml ie 25 % v/v

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Question 3 of 9

You need to prepare 66 ml of Ammonium Chloride and Morphine Mixture BP 1988. If the concentration of Chloroform and Morphine Tincture in the Mixture is 3 % v/v, how many millilitres of Chloroform and Morphine Tincture do you need?

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ml
You need 1.98 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    66    ml
100
volume of Chloroform and Morphine Tincture = 1.98 ml
OR
 3 % v/v Chloroform and Morphine Tincture means that:
100 ml of Mixture contains 3 ml of Tincture
Thus: 66 ml of Mixture contains    66    x 3 ml of Tincture
100
66 ml of Mixture contains 1.98 ml of Tincture

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Question 4 of 9

A pharmacist has an aqueous solution of ethanol containing 288 ml of absolute ethanol in 300 ml of the solution. What is the concentration of absolute ethanol in the solution?

Type in your answer and PRESS ENTER.
% v/v
The concentration of ethanol is 96 % v/v.

EITHER
 % v/v = volume of component x             100                 (ml/100 ml)
volume of product
% v/v Ethanol = 288 x    100       (ml/100 ml)
300
% v/v Ethanol = 96
OR
 300 ml of solution contains 288 ml of ethanol
Thus: 100 ml of solution contains    100    x 288 ml of ethanol
300
100 ml of solution contains 96 ml of ethanol.
Concentration of ethanol is 96 ml/100 ml ie 96 % v/v.

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Question 5 of 9

You need to prepare 250 ml of 70 % v/v ethanol. You do not have any absolute ethanol but you do have 96 % v/v ethanol. How many millilitres of the 96 % v/v ethanol - to one decimal place - do you need to have in the 250 ml to make the 70 % v/v ethanol?

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ml
You need 182.3 ml of 96 % v/v ethanol - to one decimal place.
The question has two parts:
1 Find out how many millilitres of absolute ethanol you need in the final solution.
Consider the 70 % v/v ethanol:
70 % v/v means that
100 ml of the solution contains 70 ml of ethanol
Thus: 250 ml of the solution contains 250 x 70 ml = 175 ml of ethanol
100
Therefore the final 250 ml of solution must contain 175 ml of absolute ethanol.
2 Find out what volume of 96 % v/v ethanol contains 175 ml of ethanol.
96 % v/v ethanol means there are
96 ml ethanol in 100 ml of solution
Thus: 175 ml of ethanol are in 175 x 100 ml = 182.29 ml = 182.3 ml to one decimal place.
96
    The question can be done in two parts:
  1. Find out how many millilitres of absolute ethanol you need in the final solution.
  2. Using this figure, find out what volume of 96 % v/v ethanol contains the required
    volume of absolute ethanol.

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your answer or you can click on the Answer button to see the answer.

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Question 6 of 9

A person uses an Eye Drop solution twice a day. If the person uses 32.5 microlitres of Distilled Witch Hazel each time and the solution is 13 % v/v Distilled Witch Hazel, what volume of Eye Drop solution does the person use in a week?

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ml
The person uses 3.5 ml of Eye Drop Solution.
Convert microlitres to millilitres: 32.5 µl = 0.001 x 32.5 ml = 0.0325 ml
Find out how much Eye Drop Solution the person uses each time.
13 % v/v Distilled Witch Hazel means there are
13 ml Distilled Witch Hazel in 100 ml of solution
0.0325 ml of Distilled Witch Hazel are in 0.0325 x 100 ml of solution
13
0.0325 ml of Distilled Witch Hazel are in 0.25 ml of solution.
Thus using the eye drops twice a day for one week, the person uses:
2 x 7 x 0.25 ml of solution
ie 3.5 ml of solution.

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Question 7 of 9

You need to prepare 450 ml of 40 % v/v ethanol. You do not have any absolute ethanol but you do have 96 % v/v ethanol. How many millilitres of the 96 % v/v ethanol do you need to have in the 450 ml to make the 40 % v/v ethanol?

Type in your answer and PRESS ENTER
ml
You need 187.5 ml of 96 % v/v ethanol.
The question has two parts:
1 Find out how many millilitres of absolute ethanol you need in the final solution.
Consider the 40 % v/v ethanol:
40 % v/v means that
100 ml of the solution contains 40 ml of ethanol
Thus: 450 ml of the solution contains 450 x 40 ml = 180 ml of ethanol
100
Therefore the final 450 ml of solution must contain 180 ml of absolute ethanol.
2 Find out what volume of 96 % v/v ethanol contains 180 ml of ethanol.
96 % v/v ethanol means there are
96 ml ethanol in 100 ml of solution
Thus: 180 ml of ethanol are in 180 x 100 ml = 187.5 ml
96
    The question can be done in two parts:
  1. Find out how many millilitres of absolute ethanol you need in the final solution.
  2. Using this figure, find out what volume of 96 % v/v ethanol contains the required volume of absolute ethanol.

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your answer or you can click on the Answer button to see the answer.

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Question 8 of 9

500 ml of an ethanol solution contains 208.3 ml of 96 % v/v ethanol solution. What is the concentration % v/v of ethanol in the 500 ml of solution - to one decimal place?

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% v/v
The solution is 40.0 % v/v ethanol to one decimal place.
The question has two parts:
1 Find out how many millilitres of absolute ethanol come from the
96 % v/v ethanol solution.
96 % v/v ethanol means
100 ml of solution contains 96 ml of ethanol
Thus: 208.3 ml of solution contains 208.3 x 96 ml = 199.97 ml of ethanol
100
2 Find the concentration % v/v of ethanol in the 500 ml of solution.
500 ml of solution contains 199.97 ml of ethanol
Thus: 100 ml of solution contains 100 x 199.97 ml of ethanol
500
100 ml of solution contains 39.99 ml of ethanol = 40.0 ml to one decimal place
The concentration is 40.0 ml/100 ml ie 40.0 % v/v
    The question has two parts:
  1. Find out how many millilitres of absolute ethanol come from the 96 % v/v ethanol solution.
  2. Find out the concentration of the 500 ml of ethanol solution.

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your answer or you can click on the Answer button to see the answer.

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Question 9 of 9

Up to what volume - to one decimal place - do you need to make a solution of 70 % v/v ethanol containing 546.9 ml of 96 % v/v ethanol?

Type in your answer and PRESS ENTER
ml
The 70 % v/v ethanol solution needs to be made up to 750.0 ml.
The question has two parts.
1 Find out the volume of absolute ethanol in the 70 % v/v solution by using
the information given about the 96 % v/v ethanol solution.
96 % v/v ethanol means
100 ml of solution contains 96 ml of ethanol
Thus: 546.9 ml of solution contains 546.9 x 96 ml of ethanol = 525.024 ml of ethanol.
100
2 Find the volume of the 70 % v/v solution required.
70 % v/v ethanol means there are
70 ml of ethanol in 100 ml of solution
Thus: 525.024 ml of ethanol are in 525.024 x 100 ml of solution
70
525.024 ml of ethanol are in 750.03 ml = 750.0 ml to one decimal place.
    The question has two parts:
  1. Find out the volume of absolute ethanol in the 70 % v/v solution:
    use the 96 % v/v ethanol solution.
  2. Find the volume of the 70 % v/v ethanol solution.

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your answer or you can click on the Answer button to see the answer.

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