(3) Volume from percent and drug amount

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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Calculate the volume (in mL) of an otic solution you can compound where the strength will be 2.36% w/v and the dissolved quantity of the active ingredient will be 8378 mg.


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lb equals 355 mL kg

    Percentage (w/v) means number of grams of drug present per 100 mL of the solution. Here, the strength is 2.36 %, which means, there is 2.36 g of drug dissolved per 100 mL of an otic solution. We need to determine the volume (in mL) of an otic solution which will contain 8378 mg (equals to `8378 mg × (1g)/(1000mg) = 8.378 g`) of the drug.

    `∴ (100 \quad mL)/(2.36 \quad g) = x/(8.378 \quad g) ⇒ x = 355 \quad mL`

    ∴ The volume will be 355 mL (Ans).


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