### 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 13.72 g of a drug. The drug is available as a solution form in which every 100 g contains only 93 g of the pure drug. If the solution has a specific gravity of 0.96, then determine the volume of the solution that you need to compound the product. Click on the button below to see the answer and explanations

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lb equals 15.37 mL kg

The quantity of pure drug = 13.72 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 93 g of the drug.
Therefore,

(100\quad g\quad solution)/(93\quad g\quad drug)=x/(13.72\quad g\quad drug)
Or, x = 14.753\quad g\quad  solution.

Step 2: determine the volume of the solution from its specific gravity (0.96) and weight in grams (14.753).
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 = 14.753/0.96 = 15.367.

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