(8) One formula for an O/W ointment base is as follows:

Calcium citrate

0.05 g

Sodium alginate

3.00 g

Methylparaben

0.20 g

Glycerin

45.00 g

Distilled water qs.ad

1000.00 g

How many milliliters of glycerin would be needed to prepare 500 g of the

above ointment base?

Ans: ________ ml

(9) How many grams of petrolatum would be required to make this

prescription?

Ans: __________ grams

(10) What is the specific gravity of a solution having a volume of 473

milliliters and weighing 500 grams?

Ans: __________ specific gravity

MD0802

2-8

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