2-3. SPECIFIC GRAVITY TRIANGLE
a. The triangle below is an excellent aid in the solving of specific gravity
problems.
b. To use the triangle, cover the unit for which you are solving; then, perform the
operation indicated.
c. For example: What is the specific gravity of an alcohol that has a volume of
1000 milliliters and weighs 810 grams?
Cover specific gravity:
d.
Perform the operation that is left:
grams
milliliters
Sp gr = grams
milliliters
Sp gr = 810
1000
Sp gr = 0.810
e. Example problem.
Water Soluble Ointment Base
Calcium citrate.........................................................
0.05 g
Sodium alginate.....................
3.00 g
Methylparaben.........................................................
0.20 g
Glycerin...............................................................
45.00 g
Distilled Water......To make.................................... 1000.00 ml
(1) In this formula, the amount of glycerin is given as grams, a measure of
weight. Because glycerin is a liquid, it would be easier to change the grams to milliliters
and measure the glycerin in a graduate. The specific gravity of glycerin is 1.25. How
many milliliters of glycerin would be required?
MD0802
2-3
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