(2) Quantity from volume and percent
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 the strength of 285 mL of a liquid pediatric preparation is 1.83 % `w/v`, then calculate the milligram weight of the drug contained in it.
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lb equals 5215.5 mg kg
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Percentage (w/v) means number of grams of drug present per 100 mL of the solution. Here, the strength is 1.83 %, which means, there is 1.83 g of drug dissolved per 100 mL of a liquid pediatric preparation. We need to determine the weight (in mg) of drug present in 285 mL of it.
`∴ (1.83 \quad g)/(100 \quad mL) = x/(285 \quad mL) ⇒ x = 5.2155 \quad g`
1 g equals 1000 mg.
∴ there will be `5.2155 g × (1000 mg)/(1 g) = 5215.5` mg drug present. (Ans).