(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 3520 mg of drug is dissolved in 1.1% (w/v) of a solution, then determine its volume in mL.
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lb equals 320 mL 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 1.1 %, which means, there is 1.1 g of drug dissolved per 100 mL of a solution. We need to determine the volume (in mL) of a solution which will contain 3520 mg (equals to `3520 mg × (1g)/(1000mg) = 3.52 g`) of the drug.
`∴ (100 \quad mL)/(1.1 \quad g) = x/(3.52 \quad g) ⇒ x = 320 \quad mL`
∴ The volume will be 320 mL (Ans).