Question

When Maria goes to the drug cabinet, she notes that there is 1 gram of medication in a

bottle. She adds 4 mL of sterile water. This yields 250 mg/mL. If the ordered dose is
500 mg, what should she give?

Answer 1

To calculate the amount of the medication Maria should give, you can use the concentration of the solution, which is 250 mg/mL, and the ordered dose of 500 mg.

The formula to find the volume (in mL) of the solution to give is:

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

In this case:

Volume (mL) = 500 mg / 250 mg/mL = 2 mL

Maria should give 2 mL of the solution to administer the ordered dose of 500 mg.

Answer 2

To determine the amount of medication Maria should give, we can use the concentration of the solution and the ordered dose.

Given:
- Initial amount of medication = 1 gram
- Volume of sterile water added = 4 mL
- Concentration of the solution = 250 mg/mL
- Ordered dose = 500 mg

First, we need to calculate the final volume of the solution after adding the sterile water. Since the volume of sterile water added is 4 mL, the final volume will be 4 mL + the volume of the initial medication.

The initial medication is given in grams, so we need to convert it to milligrams (mg):
1 gram = 1000 mg

Next, we can calculate the final volume of the solution:
Final volume = Volume of sterile water added + Volume of initial medication
Final volume = 4 mL + 1000 mg / concentration of the solution

Substituting the given values:
Final volume = 4 mL + 1000 mg / 250 mg/mL
Final volume = 4 mL + 4 mL
Final volume = 8 mL

Now, we can determine the amount of the solution that Maria should give to deliver the ordered dose. We can set up a proportion using the concentration of the solution:

Amount of solution / Final volume = Ordered dose / Concentration

Substituting the given values:
Amount of solution / 8 mL = 500 mg / 250 mg/mL

Cross-multiplying:
Amount of solution = (8 mL * 500 mg) / 250 mg/mL
Amount of solution = 4000 mg / 250 mg/mL
Amount of solution = 16 mL

Therefore, Maria should give 16 mL of the solution to deliver the ordered dose of 500 mg.