If a nurse needs to administer a total dose of 1200 mg using a vial that contains 200 mg/10 mL, how many mL should the nurse prepare?

To determine how many milliliters are needed to administer a total dose of 1200 mg using a solution that contains 200 mg in 10 mL, we first need to calculate the concentration of the solution. From the given information, 200 mg is dissolved in 10 mL, which means the concentration is 20 mg/mL (calculated by dividing 200 mg by 10 mL).

Next, to find out how many milliliters are required to obtain a total dose of 1200 mg, we can set up a ratio using the concentration we calculated. We divide the total required dose of 1200 mg by the concentration of the solution (20 mg/mL):

1200 mg ÷ 20 mg/mL = 60 mL

However, this calculation provides a quantity based on the intended dosage in mg and does not seem to match the choices exactly.

Now confirm the calculated volume with the concentration through a more straightforward calculation. If 200 mg is in 10 mL, then 1200 mg would proportionally require:

If 200 mg corresponds to 10 mL, then:

1 mL corresponds to 200 mg ÷ 10 mL = 20 mg/m