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Question 1 of 9
A pharmacist needs to make up 80 g of Paraffin Ointment BP 1988. If the percentage of White Beeswax in the ointment is 2 %, how many grams of White Beeswax does the pharmacist need?
g
100
Amount of Beeswax needed = 80 x 2 g
100
Amount of Beeswax needed = 1.6 g
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Question 2 of 9
Paraffin OIntment BP 1988 contains 15 g of Cetostearyl Alcohol in 300 g of ointment. What is the percentage of the Cetostearyl Alcohol - by mass?
Total Amount of All Items
Percentage of Cetostearyl Alcohol = 15 x 100 %
300
Percentage of Cetostearyl Alcohol = 5%
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Question 3 of 9
A pharmacist made up an ointment containing 25 g of Calamine resulting in a Calamine concentration of 12.5 % by mass? How many grams of ointment did the pharmacist make?
percentage
Total amount of ointment = 25 x 100 g
12.5
Total amount of ointment = 200 g
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Question 4 of 9
A chemical experiment yields 9.7 g of a compound but the expected yield was 10.1 g of the compound. What was the actual percentage yield - to one decimal place?
Total Amount of All Items
Expected Yield
Percentage yield of compound = 9.7 x 100 %
10.1
Percentage yield of compound = 96.03 = 96.0 % to one decimal place.
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Question 5 of 9
If 33.33% of Opiate Squill Linctus BP 1988 is Squill Oxymel, how many ml (to nearest ml) of Squill Oxymel are needed to prepare 150 ml of the linctus?
100
Amount of Squill Oxymel needed = 150 x 33.33 ml
100
Amount of Squill Oxymel needed = 50 ml to nearest ml
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Question 6 of 9
350 g of Compound Benzoic Acid Ointment contains 6 % Benzoic Acid by mass and 3 % Salicylic Acid by mass. The only other ingredient of the ointment is Emulsifying Ointment. How many grams of Emulsifying Ointment does the 350 g of ointment contain?
(subtract the percentages of Benzoic Acid and Salicylic Acid)
100
100
Amount of Emulsifying Ointment = 318.5 g
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Question 7 of 9
How many grams of Coal Tar would you need if you needed to prepare 180 g of a paste containing 6 % by mass of coal tar - to one decimal place?
100
Amount of Coal Tar needed = 180 x 6 g
100
Amount of Coal Tar needed = 10.8 g to one decimal place
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Question 8 of 9
A pharmacist has two eye drop solutions. The first solution contains 58.5 ml of Distilled Witch Hazel in 450 ml of solution. The second solution contains 35 ml of Distilled Witch Hazel in 250 ml of solution. What is the difference - in percent - between the strengths of the 2 solutions, considering Witch Hazel only?
Total Amount of All Items
Percentage Witch Hazel in first solution = 58.5 x 100 = 13%
450
Percentage Witch Hazel in second solution = 35 x 100 = 13%
250
Therefore difference in strength is 14-13 % = 1%
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Question 9 of 9
An experiment yielded 4.2 g of a compound which was a percentage yield of 89.7 %. What was the expected maximum yield of the experiment for this compound - to one decimal place?
Percentage
89.7
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