### (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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How many milligrams of drug do you need to prepare 290 mL of a lotion, so that the strenght becomes 2.09 % w/v?

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lb equals 6061 mg kg

Percentage (w/v) means number of grams of drug present per 100 mL of the solution. Here, the strength is 2.09 %, which means, there is 2.09 g of drug dissolved per 100 mL of a lotion. We need to determine the weight (in mg) of drug present in 290 mL of it.

∴ (2.09 \quad g)/(100 \quad mL) = x/(290 \quad mL) ⇒ x = 6.061 \quad g

1 g equals 1000 mg.

∴ there will be 6.061 g × (1000 mg)/(1 g) = 6061 mg drug present. (Ans).

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