# Percentage Calculations, Concentrations, and Dilutions True or False and Formulas.txt

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1. Compounding medications often involves the application of percentage calculations.
• True
• Percentage calculations are often used when compounding prescription medications. It entails dissolving or incorporating a drug into a larger amount of another substance.
2. How to convert a percentage into a decimal
Divide by 100
3. How to convert a fraction into a percentage
Divide the numerator by the denominator, then multiply by 100
4. How to solve a percentage calculation
Convert percentage into fraction, set up ratio and proportion calculation with known values, and solve for unknown
5. In pharmacy, percentages are expressed as a ratio of numbers of parts to 100.
True
6. Solids are expressed as mg/100 g to make a w/w%.
• False
• Solids are expressed as a weight to weight percentage or w/w%. This is a measurement of the amount of one solid (expressed in g) contained in a specific amount of another solid (per 100g).
7. When two liquids are mixed together, the concentration is expressed as a measurement of the whole amount of liquid (100 mL) to the specific amount of one liquid (x mL) or 100 mL/x mL.
• False
• When two liquids are mixed together, the concentration is expressed as a volume to volume percentage or v/v%. This is a measurement of the specific amount of one liquid to the whole amount of liquid or x mL/100mL.
8. When two liquids are mixed together, they're expressed as a v/v%.
True
9. How are solids expressed as a percentage?
w/w %

or

x g/100 g (x 100%)
10. How are two liquids mixed together exposed as a percentage?
v/v %

or

x mL/100 mL (* 100%)
11. How is a solid mixed into a liquid expressed as a percentage?
w/v %

or

x g/100 ml (* 100%)
12. Hexachlorophene 1:800 ointment contains 800 g active drug per 1 g  ointment.
• False
• It is important to remember when using ratio strengths, the drug amount is one part of the whole. There is one part of active drug (Hexachlorophine) in 800 parts ointment or 1 g per 800 g.
13. Alligation calculations help you determine how many parts of two products of different strengths you will need to prepare a(n) higher strength.
• False
• Alligation calculations help you determine how many parts of two products of different strengths you will need to prepare an intermediate strength.
14. The first step in an allegation calculation is to set up an equation with known values.
• False
• The first step in an allegation calculation is to set up an allegation table with known values.
15. The higher strength concentration in an allegation calculation is represented by the letter B.
• False
• The higher strength concentration is represented by the letter A.
16. The final strength in an allegation calculation is represented by the letter A.
• False
• The final strength calculation is represented by the letter C.
17. The values for Z and Y in an allegation calculation are found by subtracting diagonally.
True
18. Multiplying the values Z and Y in the alligation table gives you the total amount of parts needed.
• False
• When you find the values of Z and Y, add Z + Y to get the total amount of parts needed.

### Card Set Information

 Author: JeniLynn77 ID: 184787 Filename: Percentage Calculations, Concentrations, and Dilutions True or False and Formulas.txt Updated: 2012-11-24 23:32:02 Tags: percentage calculations dilutions concentrations Folders: Description: Percentage calculations, concentrations, and dilutions for pharmacy technician certification exam Show Answers:

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