(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 185 mL of a sterile liquid preparation contains 351.5 mg of drug, then determine the concentration in percent `w/v`
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lb equals 0.19 % kg
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351.5 mg equals `351.5/1000` or 0.3515 g of drug. Percentage (w/v) means number of grams of drug present per 100 mL of the solution.
`∴ (0.3515 \quad g)/(185 \quad mL) = x/(100 \quad mL) ⇒ x = 0.19 \quad g`
∴ the concentration would be `0.19 % w/v` (Ans).