(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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What will be the percentage strength of a preparation (an elixir) if 280 mL of it contains 4900 mg of the active ingredient?


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lb equals 1.75 % kg

    4900 mg equals `4900/1000` or 4.9 g of drug. Percentage (w/v) means number of grams of drug present per 100 mL of the solution.

    `∴ (4.9 \quad g)/(280 \quad mL) = x/(100 \quad mL) ⇒ x = 1.75 \quad g`

    ∴ the concentration would be `1.75 % w/v` (Ans).


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