(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 165 mL of an otic solution contains 528 mg of drug, then determine the concentration in percent `w/v`
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lb equals 0.32 % kg
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528 mg equals `528/1000` or 0.528 g of drug. Percentage (w/v) means number of grams of drug present per 100 mL of the solution.
`∴ (0.528 \quad g)/(165 \quad mL) = x/(100 \quad mL) ⇒ x = 0.32 \quad g`
∴ the concentration would be `0.32 % w/v` (Ans).