(1) Percent from weight and volume
3. Percent, Ratio, mg/mL, PPM, PPB 3.1) Percent 3.1.1) Percent - General
3.1.1.1) Percent from weight and volume Easy 1
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If 1950 milligrams of drug is present in 250 milliliter of a sterile liquid preparation, then determine the strength in percent `w/v`
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lb equals 0.78 % kg
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1950 mg equals `1950/1000` or 1.95 g of drug. Percentage (w/v) means number of grams of drug present per 100 mL of the solution.
`∴ (1.95 \quad g)/(250 \quad mL) = x/(100 \quad mL) ⇒ x = 0.78 \quad g`
∴ the concentration would be `0.78 % w/v` (Ans).