Alligation Methods Workshop Questions PDF

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5PY022

Workshop questions for WB 2:1 Alligation Calculators are permitted

Question 1 How many millilitres of 90% v/v alcohol should be added to an appropriate volume of 60% v/v alcohol to produce 450 mL of a solution containing 70% v/v alcohol? WORKING

mL 90%v/v

Answer:

Question 2 An ointment contains 2% w/w salicylic acid. How many grams of pure salicylic acid powder should be added to 180 g of the ointment to produce 10% w/w salicylic acid ointment? WORKINGWORKING O

Answer:

grams

Question 3 Using the alligation medial technique, check that your answer from question 2 does result in a final product which contains 10% w/w salicylic acid.

%w/w

Answer:

JD

1

November 2020

5PY022 Workshop questions for WB 2:1 Alligation Question 4 You receive a prescription from a local dermatologist requesting 95 g of a 0.5% w/w dithranol cream. You have a 25 g tube of 2% w/w dithranol and 100 g tube of 0.1% w/w. How many grams of the 2% w/w dithranol should be added to an appropriate quantity of the 0.1% w/w strength to make 95 g of 0.5% w/w dithranol?

O

grams 2% w/w

Answer:

Question 5 You want to make up 360 mL of a 45%v/v solution of ethanol as an ingredient in a manufacturing process. You have 2 litres of 70% v/v ethanol and a 500 mL bottle of 10% v/v ethanol. How many mL of the 10% v/v ethanol solution do you need to mix with an appropriate quantity of the 70% v/v ethanol solution?

mL 10%v/v

Answer:

Question 6 Calculate the number of mLs of Stock Solution A (a 2%w/v solution) that must be mixed with an appropriate volume of Stock Solution B (a 1.4%w/v solution) to produce 300 mL of a solution containing 80 mg/5 mL. O

Answer: JD

mL of Solution A 2

November 2020

5PY022 Workshop questions for WB 2:1 Alligation Question 7 What is the concentration, in mmol/L, of a solution prepared by dissolving 4.5 g of anhydrous glucose in water, which is then made up to a final volume of 250 mL? (Mr anhydrous glucose = 180).

Answer:

mmol/L

Question 8 Following on from question 7, how many grams of glucose BP would be required to prepare 250 mL of a solution containing the same concentration of glucose? (Mr glucose BP [glucose monohydrate] = 198). Give your answer to 2 decimal places.

Answer:

grams

Question 9 A baby requires an antibiotic suspension for an infected wound. She weighs 3.5 kg and has been prescribed a dose of 80 mg/kg/day, given in divided doses every six hours, for seven days. The strength of the suspension is 125 mg in 5mL. How many mL of suspension would you need to supply to ensure that there is sufficient to complete the course? Give your answer to the nearest whole mL.

Answer: JD

mL 3

November 2020...