Unit 5 Flashcards
Formula of Density
Density = Mass/ Volume
Mass per unit volume of a substance
Density
How is density usually expressed?
1 g/cc or 1 g/mL
A ratio, expressed decimally, of the weight of a substance to the weight of an equal volume of a substance chosen as a standard, both substances at the same temperature.
Specific Gravity
What is the useful standard for sp gr in solids and liquids?
Water
What is the useful standard for sp gr in gases?
Hydrogen
The formula of sp gr
Sp gr = weight of a substance/ weight of equal volume of water
Substances that have a specif c gravity less than 1 are ____.
Lighter than water
Substances that have a specif c gravity greater than 1 are ____.
Heavier than water
Sp gr are based on data from temperature of ____, except alcohol that is _____.
25 C; 15.56 C
What kind of number is density?
Concrete
What kind of number is sp gr?
Abstract
What is the sp gr of water?
1
A special glass bottle used to determine specific gravity ranging from ____.
Pycnometer; 1-50 mL
Why pycnometers have fitted glass stoppers?
To allow trapped air and excess fluid to escape
What is an automated compounders?
Automated, computer-controlled pharma equipment in the preparation of multicomponent mixtures for parenteral nutrition.
What is an important factor of urinalysis?
Sp gr
What is sp gr of urine in adults?
1.020-1.028
What does sp gr indicates?
Concentration of particle’s in urine
Degree of hydration
What does higher than normal sp gr urine indicate?
Concentrated
Why is there a higher than normal sp gr of urine?
Due to excess waste products or electrolytes, the presence of glucose (glucosoria), or protein (proteinuria), excessive water loss, decreased fluid intake, etc.
What does a low sp gr of urine indicate?
Diluted urine
Where does low sp gr of urine result from?
Diabetes insipidus
Renal disease
Increased fluid intake
IV hydration
What does percent indicate?
The number o parts in a hundred.
How is percent used?
Used to express the strength of a component
Determine the quantity of a component
Expresses the number o grams o a constituent in 100 mL o solution or liquid preparation and is used regardless o whether water or
another liquid is the solvent or vehicle.
Percent w/v
Expresses the number o milliliters o a constituent in 100 mL o solution or liquid preparation.
Percent v/v
Expresses the number o milliliters o a constituent in 100 mL o solution or liquid preparation.
Percent w/w
For solutions or suspensions of solids in liquids
Percent w/v
For solutions of liquids in liquids
Percent v/v
For mixtures of solids or semisolids
Percent w/w
For solutions of gases in liquids
Percent w/v
