(1) grams = specific gravity x milliliters

grams = .85 x 8

grams = 6.8

(2) Then, add the weights of all ingredients except the white petrolatum.

14.0 g zinc oxide

+4.0 g sulfur, ppt

6.8 g mineral oil

24.8 g

(3) Subtract this from the total volume.

100.0 g total volume

-24.8 g other substances

75.2 g white petrolatum required

(4) The above problem is a typical pharmaceutical calculation problem

involving specific gravity.

h.

Solve the following problems and check your answers.

(1) What is the volume of 250 g of a liquid having a specific gravity of 1.65?

Ans: ___________ ml

MD0802

2-5

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