What volume of a solution with a concentration of 25 mg/mL is needed to provide a dose of 20 mg?

To determine the volume of a solution needed to provide a specific dose, you can use the formula that relates concentration, dose, and volume:

Volume (mL) = Dose (mg) / Concentration (mg/mL)

In this case, you need to provide a dose of 20 mg from a solution with a concentration of 25 mg/mL.

Plugging in the values:

Volume = 20 mg / 25 mg/mL

Volume = 0.8 mL

This calculation shows that to achieve a dose of 20 mg using the given concentration, a total volume of 0.8 mL is required. Therefore, the chosen answer of 0.8 mL is correct. Understanding this calculation is crucial for pharmacy technicians, as it is a common scenario when determining how much of a medication should be administered based on its concentration.