Flexible Collodion q.s. 100 mL (FYI: collodion is a flammable, syrupy solution applied to skin)

Flexible Collodion q.s. 100 mL (FYI: collodion is a flammable, syrupy solution applied to skin)
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Q:

Acid 1: 5% w/v

Acid 2: 10% w/v

Flexible Collodion q.s. 100 mL (FYI: collodion is a flammable, syrupy solution applied to skin)

How many mL of an 85% w/w solution of Acid 1 with a specific gravity of 1.21 should be used in preparing the prescription?

A:

Acid 1: 5 g/100 mL x 100 mL = 5 g of Acid 1 in the prescription

5 g x 100 g solution /85 g Acid 1 = 5.88 g solution

Volume V = mass/d = 5.88 g solution / 1.21 g/mL = 4.86 mL of 85% w/w Acid 1 solution.