(4) Mixed Types of Percentage problems

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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What will be the percentage strength of a preparation (an antidiarrheal solution) if 55 mL of it contains 187 mg of the active ingredient?


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lb equals 0.34 % kg

    187 mg equals `187/1000` or 0.187 g of drug. Percentage (w/v) means number of grams of drug present per 100 mL of the solution.

    `∴ (0.187 \quad g)/(55 \quad mL) = x/(100 \quad mL) ⇒ x = 0.34 \quad g`

    ∴ the concentration would be `0.34 % w/v` (Ans).


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