What is the concentration in mg/mL if a solution contains 800 mg in 200 mL?

To determine the concentration of the solution in milligrams per milliliter (mg/mL), you divide the total amount of the solute (in this case, the medication) by the total volume of the solution.

Here, you have 800 mg of medication in a total volume of 200 mL. The calculation is as follows:

Concentration (mg/mL) = Total amount of solute (mg) / Total volume of solution (mL)

Substituting the given values:

Concentration = 800 mg / 200 mL = 4 mg/mL

This calculation shows that the concentration of the solution is 4 mg/mL, reflecting the correct choice. This method of calculating concentration is a fundamental concept in medication dosage and preparation, as it allows healthcare professionals to determine how much medication is present in a specific volume of solution, which is crucial for safe and effective patient care.