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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