(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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If 1148 mg of drug is dissolved in 0.82% (w/v) of a vaginal douche, then determine its volume in mL.


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lb equals 140 mL kg

    Percentage (w/v) means number of grams of drug present per 100 mL of the solution. Here, the strength is 0.82 %, which means, there is 0.82 g of drug dissolved per 100 mL of a vaginal douche. We need to determine the volume (in mL) of a vaginal douche which will contain 1148 mg (equals to `1148 mg × (1g)/(1000mg) = 1.148 g`) of the drug.

    `∴ (100 \quad mL)/(0.82 \quad g) = x/(1.148 \quad g) ⇒ x = 140 \quad mL`

    ∴ The volume will be 140 mL (Ans).


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