### SG - volume of stock as the source of drug

2. Density & Specific Gravity 2.1) Specific Gravity 2.1.3) SG - volume of stock as the source of drug

2.1.3.1) SG - volume of stock as the source of drug Hard 1

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A pharmacist needs 14.6 g of a drug. The drug is available as a solution form in which every 100 g contains only 87 g of the pure drug. If the solution has a specific gravity of 0.85, then determine the volume of the solution that you need to compound the product.

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lb equals 19.74 mL kg

The quantity of pure drug = 14.6 g.

Step 1: determine the weight of the solution which will be used as the source of the drug.
100 g of the solution provides 87 g of the drug.
Therefore,

(100\quad g\quad solution)/(87\quad g\quad drug)=x/(14.6\quad g\quad drug)
Or, x = 16.782\quad g\quad  solution.

Step 2: determine the volume of the solution from its specific gravity (0.85) and weight in grams (16.782).
We know that,
SG = (Weight\quad i n\quad grams)/(volume\quad i n\quad mL)
Or, Volume\quad i n \quad mL = (Weight\quad i n \quad grams) / (SG)
Or Volume\quad i n \quad mL = 16.782/0.85 = 19.743.

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