Calculations Exam 1 - All practice problems from hw and slide

975 mg

If 12 tablets contain 3900 mg of aspirin, how

many mg should 3 tablets contain?

12 tablets

If 3 tablets contain 975 mg of aspirin, how many tablets should contain 3900 mg?

15 mL

If one dose of a cough syrup is 1 ¼ mL for a small child, how many mL will be needed for 12 doses of the syrup?

84.5 fl oz

How many fl. oz are in 2.5 L?

240 mg

A cough syrup contains 10 mg of dextromethorphan hydrobromide per 5 mL. How many mg of drug are contained in a 120-mL container of the syrup?

100 mg

A capsule contains the below amounts of

medicinal substances. What is the total weight of

the substance in the capsule?

• 0.075 g

• 20 mg

• 0.0005 g

• 4 mg

• 500 mcg

30 mg; 0.03 g

What is ½ grain in mg? In g?

45.45 kg

Convert 100 lbs to kg.

6.25 g of digoxin

How many g of digoxin (lanoxin) would be required to make 25,000 tablets each containing 250 mcg of digoxin?

50 mg/mL

Adalimumab (Humira) is available 40mg/0.8mL. Calculate the concentration of the medication on a (1) mg/mL basis.

100,000 μL

Convert 100 mL to μl.

24.4 mL/hour

If an IV (intravenous) solution containing 123 mg of substance in each 250 mL bottle, and the administration rate is 200 μg of drug per minute, how many mL of the solution would be given per hour?

15 kg

What is the child's weight in kg?

1 tsp = 5 mL

1 tbsp = 15 mL

How many milliliters are in:

A. 1 teaspoon (tsp)?

B. 1 tablespoon (tbsp)?

480 mg per dose

How many milligrams of acetaminophen did the child receive per dose based on what was administered?

2880 mg

If the child received one dose every 4 hours, how many total milligrams of acetaminophen did the child receive in that 24-hour period?

15 g

Based on the child's weight, how many grams of activated charcoal should be given?

192 mg/kg

Ingestions >150 mg/kg are considered toxic. Based on the amount the child ingested, would you consider this a toxic amount?

500 mg

0.5 g = _______ mg

4,000 g

4 kg = _____ g

0.225 g

225 mg = _____ g

1.555 mg

1,555 mcg = _____ mg

125 mcg

0.125 mg = ______ mcg

8 mg

0.008 g = _____ mg

100 mcg

0.1 mg = _________ mcg

20 mg

0.02 g = ________ mg

3 L

3,000 ml = _________ L

150 mL

0.15 L = _____ mL

0.1 L

100 mL = _____ L

2,500 mL

2.5 L = _____ mL

0.775 L

775 mL = _________L

600 mL

0.6 L = ________ mL

10 mL

2 tsp = _____ mL

30 mL

1 fluid ounce = _____ mL

28,350 mg

1 ounce = _______ mg

15 mL

1 tbsp = _______ mL

720 mL

1.5 pints = _____ mL

256 fl oz

2 gallons = ____ fluid ounces

85 kg

187 lb = _____ kg

subcutaneous

SubQ = ___________

before meals

a.c.= _____________

as needed

p.r.n. = ___________

As desired / freely

Ad lib = ___________

Every two hours

Q 2 h = __________

Immediately

Stat = __________

Hour

H = _____________

Sublingual

SL = ____________

Take 100 mcg of Synthroid by mouth every morning.

Interpret the following drug orders:

Synthroid 100 mcg p.o. q am

Give 5,000 units of heparin subcutaneously every 12 hours.

Interpret the following drug orders:

Heparin 5000 units SubQ Q12H

Take 1 tablet of Coumadin 5 mg on Monday, Wednesday, and Friday, and ½ tablet on all other days (Tuesday, Thursday, Saturday, and Sunday).

Interpret the following drug orders:

Coumadin T1T 5 mg MWF, and ½ tablet on all other days

Take MOM by mouth once daily as needed for constipation.

Interpret the following drug orders:

MOM p.o. daily p.r.n. for constipation

~2 unit-dose containers

A patient is receiving MOM 30 mL For constipation. The pharmacy only has milk of magnesia available in 1/2 fl ounce unit dose cups. How many unit dose containers would be needed to provide the ordered dose?

milligrams

mg

micrograms

mcg

milliliter

mL

Liter

L

kilogram

kg

drop

gtt

teaspoon

tsp

tablespoon

tbsp

ounce

oz

gram

g

fluid ounce

fl. oz

3785 mL

1 gallon is approximately equal to:

Take 650 mg of Acetaminophen by mouth every six hours as needed if temperature is over 38.5 degrees Celsius.

Interpret the following medication order in your own words:

Acetaminophen 650 mg PO q6h PRN temp >38.5°C

I would move the decimal 3 places to the left.

Explain how you would convert 1000 mL to 1 L.

4 mL

2 mL

1 mL

What is the least amount that can be accurately measured in a 20, 10, & 5 mL syringe?

Weigh 120 mg of atropine sulfate and 3,480 mg of lactose. Mix thoroughly to make 3,600 mg total. Then weigh out 120 mg of the mixture. This 120-mg aliquot contains 4 mg of atropine sulfate and meets the 5% accuracy requirement.

A torsion prescription balance has a SR of 6mg. Explain how you would weigh 4mg of atropine sulfate with an accuracy of 5% using lactose as the diluent.

Weigh 120 mg of the drug and 600 mg of lactose. Mix thoroughly to make 720 mg total. Then weigh out 120 mg of the mixture. This 120 mg aliquot contains 20 mg of the drug with 5% accuracy.

If 20 mg of a drug substance is needed to fill a prescription, how would you obtain this amount of drug with an accuracy of 5% using a balance with a SR of 6mg. Use lactose as diluent.

4%

A pharmacist is weighing 125 mg of a drug on a balance.

But after weighing and checking, it turns out the actual amount

dispensed was 130 mg. Find the percent error.

6.25% error

Using a graduated cylinder, a pharmacist measured 30 mL of a liquid.

On subsequent examination, using a narrow-gauge burette, it was

determined that the pharmacist had actually measured 32 mL. What

was the percentage of error in the original measurement?

1.8 g/mL

What is the density of 10 mL of sulfuric acid weighing 18 g?

0.81 g/mL

If 250 mL of alcohol weigh 203 g, what is its density?

1.8

If 10 mL of sulfuric acid weighs 18 g and 10 mL of water weighs 10 g, what is the specific gravity?

1.27

If a pint of liquid weighs 601 g, what is the specific gravity of the liquid?

1.285

If a liter of cough syrup weighs 1285 g, what is its specific gravity?

295.5 g

What is the weight, in g, of 360 mL of alcohol

with a specific gravity of 0.82?

25.5 g

A pharmacist needs to prepare 30 capsules, each containing 850 mg of fish oil (sp gr 0.907). How many mL of fish oil would be needed to prepare the total quantity of capsules?

3,000 mg of syrup

Rimantadine HCl syrup contains 2.4 g of rimantadine HCl in each 240 ml of syrup. The syrup has a density of 1.2 g/ml. What is the weight in mg of a 2.5 ml dose of syrup?

150 g of dextrose

How many grams of dextrose are contained in a 250 ml infusion of dextrose injection containing 60 g of dextrose per 100 ml if its specific gravity is 1.2?

300 g

What is the weight of 250 ml of dextrose 60 g/100 ml IV solution (SG of 1.2)?

1.46 mL

Lactic acid is available as a liquid containing 85 g of the acid in 100 g of solution (SG 1.21). Calculate the volume of solution needed to fill a prescription for wart remover calling for 1.5 g of lactic acid.

460 mL

Syrup, USP is prepared by dissolving 850 g of sucrose in sufficient purified water to make 1000 ml of syrup. Syrup has a SG of 1.31. How many ml of water are used to prepare a liter of syrup?

1 mL syringe

What syringe size should be used to accurately measure 0.75 mL?

20 mL syringe

What syringe size should be used to accurately measure 15 mL?

1 mL syringe

What syringe size should be used to accurately measure 1 mL?

a. Weight: 150 mg of chlorpheniramine

b. Dilute With: 450 mg lactose

c. To make (total): 600 mg

d. Weigh/use: 200 mg of aliquot

A prescription calls for 50 mg of chlorpheniramine maleate. Using a prescription balance with a sensitivity requirement of 6 mg, explain how you would obtain the required amount of chlorpheniramine maleate with an error not >5%. ( Weigh 150 mg drug; Use 200 mg as aliquot )

a. Weigh: 150mg of chlorpheniramine

b. Dilute with:

c. To make (total):

d. Weigh/use: 200 mg of aliquot

Measure: 5 mL dye

Dilute to: 8 mL with water for a total volume of

Measure/use: 2 mL aliquot from solution

Using a 10-mL graduate with a minimum accurate volume of 2 mL, explain how you would measure 1.25 mL of a dye solution by the aliquot method. Use water as the diluent. (Measure 5 mL dye; Use 2 mL as aliquot ).

a. Measure 5 mL dye

b. Dilute to _____ mL with water for a total volume of

c. Measure/use 2 mL aliquot from solution

5%

In compounding a prescription, a pharmacist weighed 50 mg of a substance on a balance with a sensitivity requirement of 4 mg. What was the maximum acceptable error according to industry standard in terms of percentage?

313.5 mg to 346.5 mg

A student pharmacist prepares capsules in the compounding lab, and the contents of each capsule should weigh 330 mg. What would be the weight range for each capsule to fall within a ±5% error range?

1.59 g/mL

A metal substance weighs 84.2 g and has a volume of 53 mL. Calculate its density.

0.2

If a half gallon of a certain liquid weighs 378.4 g, what is the specific gravity of the liquid?

169.88 g

Concentrated hydrochloric acid solution has a specific gravity of 1.37.

What would be the weight of 124 mL of this solution?

4.16 kg

What is the weight, in kilograms, of 8 liters of a liquid with a specific gravity of 0.52?

250.25 g

Calculate the total weight of the following formula for a pediatric chewable gummy gel base for medication.

79.485 g

If 300 mL of mineral oil are used to prepare a liter of mineral oil emulsion, how many grams of the oil, having a specific gravity of 0.07, would be used in the preparation of 1 gallon of the emulsion?

Weigh: 80mg of hydromorphone

Dilute with: 1.52 g lactose

To make: 1.6 g mixture

Weigh/use: 100 mg aliquot from mixture

A torsion prescription balance has a sensitivity requirement of 4 mg. Explain how you would weigh 5 mg of hydromorphone hydrochloride with an error not >5%. Use lactose as the diluent. (Weigh 80 mg drug; Use 100 mg as aliquot).

a. Weigh:

b. Dilute with:

c. To make:

d. Weigh/Use:

7.5%

A pharmacy student attempts to measure 40 mL of water in a 2-XXX.oz. bottle, then double-checks his measurement with a 50-mL graduated cylinder. The volume of water when measured in the graduated cylinder is 37 mL. What is the percent error in his measurement?

6.67%

A pharmacist attempts to weigh 0.375 g of morphine sulfate on a balance of dubious accuracy. When checked on a highly accurate balance, the weight is found to be 0.4 g. Calculate the percentage of error in the first weighing.

24 g of sodium

How many grams of sodium is required to prepare 300 mL of 8% w/v solution?

8% w/v = 8 grams of sodium in 100 mL of solution