### (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 480 mL of a nasal wash, so that the strenght becomes 2.18 % w/v?

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lb equals 10464 mg kg

Percentage (w/v) means number of grams of drug present per 100 mL of the solution. Here, the strength is 2.18 %, which means, there is 2.18 g of drug dissolved per 100 mL of a nasal wash. We need to determine the weight (in mg) of drug present in 480 mL of it.

∴ (2.18 \quad g)/(100 \quad mL) = x/(480 \quad mL) ⇒ x = 10.464 \quad g

1 g equals 1000 mg.

∴ there will be 10.464 g × (1000 mg)/(1 g) = 10464 mg drug present. (Ans).