Percentage Calculations Percentage Calculations Dont let percentages fool

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Percentage Calculations

Percentage Calculations

Percentage Calculations Don’t let percentages fool you! Percentages are just ratios in disguise!

Percentage Calculations Don’t let percentages fool you! Percentages are just ratios in disguise!

Percentages There are 3 types of percentages in pharmacy calculations: 1. Percent weight-in-weight (w/w)

Percentages There are 3 types of percentages in pharmacy calculations: 1. Percent weight-in-weight (w/w) 2. Percent volume-in-volume (v/v) 3. Percent weight-in-volume (w/v) The units of these percentages will ALWAYS be GRAMS or ML

Percentage Calculations •

Percentage Calculations •

Percentage Calculations •

Percentage Calculations •

Percentage Calculations Interpreting the type of percentage can only be done with practice. So,

Percentage Calculations Interpreting the type of percentage can only be done with practice. So, let’s do some practice problems- together!

Question #1 Iodine tincture is available as a 2% solution of iodine. How many

Question #1 Iodine tincture is available as a 2% solution of iodine. How many grams of iodine will be contained in 40 m. L of tincture?

Answer #1 •

Answer #1 •

Question #2 You have 25 grams of a drug and need to compound a

Question #2 You have 25 grams of a drug and need to compound a 30% solution. How many m. L will you prepare?

Answer #2 •

Answer #2 •

Question #3 You add 80 grams of a drug to 600 m. L of

Question #3 You add 80 grams of a drug to 600 m. L of sterile water. What is the percentage strength of the solution prepared?

Answer #3 •

Answer #3 •

Question #4 You have an order for 2 g of calcium gluconate to add

Question #4 You have an order for 2 g of calcium gluconate to add to a 1000 m. L bag of 5% dextrose injection. The label on the calcium gluconate vial gives the concentration as 10% and 0. 465 m. Eq/m. L. How many m. L of calcium gluconate will you need to use?

Answer #4 •

Answer #4 •

Question #5 The technician is to prepare 30 m. L of a 20% solution

Question #5 The technician is to prepare 30 m. L of a 20% solution using 300 mg tablets. How many tablets are needed?

Answer #5 •

Answer #5 •

Question #6 You have on hand 500 mg of a powder. How many m.

Question #6 You have on hand 500 mg of a powder. How many m. L of a 2% solution can you prepare?

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Answer #6 •

Question #7 Devonex is a topical ointment available in a 0. 005% concentration. How

Question #7 Devonex is a topical ointment available in a 0. 005% concentration. How many mg of the active ingredient are contained in 60 g?

Answer #7 •

Answer #7 •

Question #8 Devonex is a topical ointment available in a 0. 005% concentration. How

Question #8 Devonex is a topical ointment available in a 0. 005% concentration. How many mg of the active ingredient are contained in 60 g?

Answer #8 •

Answer #8 •

Question #9 You have in stock a 30 m. L vial of 23. 4%

Question #9 You have in stock a 30 m. L vial of 23. 4% concentrated sodium chloride injection. How many grams of sodium chloride are in the vial? How many mg are in 1 ml?

Answer #9 •

Answer #9 •

Question #10 Hydrocortisone topical cream is available as a 0. 2% concentration in 454

Question #10 Hydrocortisone topical cream is available as a 0. 2% concentration in 454 grams. How many mg of hydrocortisone are in the product?

Answer #10 •

Answer #10 •

Question #11 A medication is available as 1 g/3 m. L in 20 m.

Question #11 A medication is available as 1 g/3 m. L in 20 m. L vials. Express this drug concentration as a percentage strength.

Answer #11 •

Answer #11 •

Question #12 A physician orders 450 mcg of a medication. The med is available

Question #12 A physician orders 450 mcg of a medication. The med is available as a 0. 025% solution. How many m. L will be required to fill the order?

Answer #12 •

Answer #12 •

Question #13 You need to prepare 750 m. L of a 1: 500 w/v

Question #13 You need to prepare 750 m. L of a 1: 500 w/v potassium permanganate solution. How many grams are needed?

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Answer #13 •

Question #14 A 1: 50, 000 lidocaine solution is to be given to a

Question #14 A 1: 50, 000 lidocaine solution is to be given to a patient. What is the concentration of the solution in mcg/m. L?

Answer #14 •

Answer #14 •

Question #15 A technician is to add 1. 2 mg of a drug to

Question #15 A technician is to add 1. 2 mg of a drug to a 25 m. L bag of 5% dextrose injection. On hand is a 2 m. L ampoule of a 1: 1, 000 w/v solution. How many m. L should be added to the bag?

Answer #15 •

Answer #15 •

Question #16 A technician is asked to prepare 350 m. L of a 22%

Question #16 A technician is asked to prepare 350 m. L of a 22% boric acid solution from a 50% boric acid solution and purified water. How many m. L of 50% solution and water will be needed?

Answer #16 • 50 22 22 0 28 = 50 total parts

Answer #16 • 50 22 22 0 28 = 50 total parts

Question #17 Stock solutions of 27% and 31% are available in the pharmacy. How

Question #17 Stock solutions of 27% and 31% are available in the pharmacy. How many m. L of each stock solution are needed to prepare 2 L of a 29% solution

Answer #17 • 31 2 29 27 2 = 4 total parts

Answer #17 • 31 2 29 27 2 = 4 total parts

Question #18 An order for 6 L of 0. 9% sodium chloride solution is

Question #18 An order for 6 L of 0. 9% sodium chloride solution is to be prepared from 23. 4% concentrated Na. Cl solution and sterile water for injection. How many m. L of each should be used?

Answer #18 • 23. 4 0. 9 0 22. 5 = 23. 4 total

Answer #18 • 23. 4 0. 9 0 22. 5 = 23. 4 total parts