(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 2848.5 milligrams of drug is present in 135 milliliter of an ophthalmic solution, then determine the strength in percent `w/v`


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lb equals 2.11 % kg

    2848.5 mg equals `2848.5/1000` or 2.8485 g of drug. Percentage (w/v) means number of grams of drug present per 100 mL of the solution.

    `∴ (2.8485 \quad g)/(135 \quad mL) = x/(100 \quad mL) ⇒ x = 2.11 \quad g`

    ∴ the concentration would be `2.11 % w/v` (Ans).


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