(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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Calculate the volume (in mL) of a mint-flavored mouth wash you can compound where the strength will be 2.34% w/v and the dissolved quantity of the active ingredient will be 10530 mg.


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lb equals 450 mL kg

    Percentage (w/v) means number of grams of drug present per 100 mL of the solution. Here, the strength is 2.34 %, which means, there is 2.34 g of drug dissolved per 100 mL of a mint-flavored mouth wash. We need to determine the volume (in mL) of a mint-flavored mouth wash which will contain 10530 mg (equals to `10530 mg × (1g)/(1000mg) = 10.53 g`) of the drug.

    `∴ (100 \quad mL)/(2.34 \quad g) = x/(10.53 \quad g) ⇒ x = 450 \quad mL`

    ∴ The volume will be 450 mL (Ans).


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