(4) Mixed Types of Percentage problems

3. Percent, Ratio, mg/mL, PPM, PPB 3.1) Percent 3.1.1) Percent - General Percent from weight and volume Easy 1

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What will be the percentage strength of a preparation (a lotion) if 185 mL of it contains 4070 mg of the active ingredient?

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lb equals 2.2 % kg

    4070 mg equals `4070/1000` or 4.07 g of drug. Percentage (w/v) means number of grams of drug present per 100 mL of the solution.

    `∴ (4.07 \quad g)/(185 \quad mL) = x/(100 \quad mL) ⇒ x = 2.2 \quad g`

    ∴ the concentration would be `2.2 % w/v` (Ans).