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Aliquot Calculations Quiz

Aliquot Calculation Quiz

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Question 1 of 10
1. Question
2 points
A pharmacist is asked to weigh 140 mg of lidocaine powder on the standard balance. The maximum percent error by law is 5% and the balance states the sensitivity requirement is 3 mg. What is the minimum weighable quantity? Do not include units.
Correct
Incorrect
Question 2 of 10
2. Question
2 points
What is the smallest quantity that can be weighed on a scale that has a sensitivity requirement of 5 mg and an acceptable error of 7%? Round to the nearest tenth. Do not include units.
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Incorrect
Question 3 of 10
3. Question
2 points
Explain how you would use the aliquot method of weighing to obtain 15 mg of codeine sulfate if you have a standard pharmacy balance. Use lactose as an inert diluent.
- 1600 mg of mixture containing 120 mg of codeine sulfate and 1480 mg of lactose.
- 1333 mg mixture containing 200 mg of codeine sulfate and 1133 mg of lactose.
- 1640 mg of mixture containing 100 mg of codeine sulfate and 1600 mg of lactose.
- 1600 mg of mixture containing 100 mg of codeine sulfate and 1500 mg of lactose.
- 1600 mg of mixture containing 200 mg of codeine sulfate and 1400 mg of lactose.
Correct
Incorrect
Question 4 of 10
4. Question
2 points
You are reviewing a prescription that asked to weigh 5 mg of hydromorphone hydrochloride. The final mixture was 4500 mg containing 150mg of hydromorphone hydrochloride and 4350 mg of lactose. What is the maximum percent error of weighing assuming 120 mg as the minimum weighable quantity (MWQ) and a sensitivity requirement (SR) of 3 mg. Round to the nearest tenth. Do not include percent sign.
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Incorrect
Question 5 of 10
5. Question
2 points
A prescription balance has a sensitivity requirement of 8 milligrams. The prescription asks you to weigh 10 mg of morphine sulfate with an error not greater than 5%. How would you weigh this amount using lactose as your diluent?
- 4000 g of mixture containing 300 mg of morphine sulfate and 3700 mg of lactose.
- 4 g of mixture containing 300 mg of morphine sulfate and 3.7 g of lactose.
- 2 g of mixture containing 100 mg of morphine sulfate and 1900 mg of lactose.
- 2560 mg of mixture containing 160 mg of morphine sulfate and 2400 mg of lactose.
- 2500 mg of mixture containing 160 mg of morphine sulfate and 2340 mg of lactose.
Correct
Incorrect
Question 6 of 10
6. Question
2 points
A prescription asks you to measure a volume of 0.75 mL of a 10mg/mL solution and the smallest graduated cylinder you have is 10 ml. Using water as diluent, how would you prepare this volume.
- Measure ¼ of dilution (3 mL) which will contain 0.75 mL
- Measure 1/8 of dilution (2 mL) which will contain 0.50 mL.
- Measure 1/8 of dilution (3 mL) which will contain 0.75 mL.
- Measure ¼ of dilution (2 mL) which will contain 0.75 mL.
- Measure 1/8 of dilution (2 mL) which will contain 0.75 mL.
Correct
Incorrect
Question 7 of 10
7. Question
2 points
A formula calls for 0.8 milliliter of a coloring solution. Using a 10-mL graduate calibrated from 2 to 10 milliliter units in 1-milliliter units, how could you obtain the desired quantity of the coloring solution by the aliquot method? Use water as diluent.
- 1/5th of 4 mL mixture of 0.8 mL coloring solution and 3.2 mL water.
- 1/5th of 10mL mixture of 4 mL coloring solution and 6 mL water.
- 1/4th of 10mL mixture of 3 mL coloring solution and 7 mL water.
- 1/4th of 10 mL mixture of 4 mL coloring solution and 6 mL water.
- 1/6th of 10 mL mixture of 4 mL coloring solution and 6 mL water.
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Incorrect
Question 8 of 10
8. Question
2 points
How much drug and diluent do you need to measure 12 mg of the drug on a scale that has a sensitivity requirement of 6 mg and an acceptable error of 6%?
- 108 mg of drug, 792 mg diluent
- 12 mg of drug, 1092 mg diluent
- 108 mg of drug, 1200 mg diluent
- 12 mg of drug, 12 mg diluent
- 108 mg of drug, 1188 mg diluent
Correct
Incorrect
Question 9 of 10
9. Question
2 points
A pharmacist is asked to weigh 50 mg of oxymorphone on a prescription balance having a sensitivity requirement of 6 mg. How would you weigh this amount with an acceptable error in weighing of 5% using lactose as the diluent?
- 288 mg of mixture containing 168 mg of oxymorphone and 120 mg of lactose.
- 120 mg mixture containing 50 mg of oxymorphone and 70 mg of lactose.
- 120 mg of mixture containing 70 mg of oxymorphone and 50 mg of lactose.
- 288 mg of mixture containing 120 mg of oxymorphone and 168 mg of lactose.
- 120 mg of mixture containing 90 mg of oxymorphone and 30 mg of lactose.
Correct
Incorrect
Question 10 of 10
10. Question
2 points
Explain how you would weigh 5 mg of sodium phenobarbital if you have a standard pharmacy balance using lactose as your diluent.
- 3840 mg mixture containing 160 mg of phenobarbital and 3680 mg of lactose.
- 2640 mg mixture containing 110 mg of phenobarbital and 2530 mg of lactose.
- 2640 mg mixture containing 160 mg of phenobarbital and 2580 mg of lactose.
- 3840 mg mixture containing 180 mg of phernobarbital and 3660 mg of lactose.
- 3840 mg mixture containing 160 mg of phenobarbital and 3600 mg of lactose.
Correct
Incorrect

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