(b)

Find 1 percent of the total amount:

1 percent of 120 = 1.2

(c)

One percent of volume times the number of percent = Amount of

active ingredient.

1.2 X 2 = 2.4 grams of ephedrine sulfate needed.

designation is dependent upon whether the active ingredient is a solid or a liquid.

Because ephedrine sulfate is a solid, the unit designation is grams.

(2) Example #2: How many grams of boric acid are needed to make 240 ml

of a 5% (w/v) boric acid solution?

(a)

The total amount of preparation is 240 ml.

(b)

1 percent of 240 = 2.4

(c)

2.4 X 5 = 12 grams of boric acid required.

(3) Example #3: How many grams of zinc oxide are needed to make 120

grams of 20% zinc oxide paste?

(a)

The total amount of the preparation is __________ grams.

(b)

1 percent of the total amount is ____________.

(c)

______X______ = ________ grams of zinc oxide needed.

Solution:

(a)

The total amount of the preparation is 120 grams.

(b)

1 percent of the total amount is 1.2.

(c)

1.2 X 20 = 24 grams of zinc oxide required.

MD0802

2-15

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