Question

what is the equivalent of 8 fl oz of ¼ strength hydrogen peroxide?
1.0 fl oz of hydrogen peroxide
2 fl oz of hydrogen peroxide
4 fl oz of 1/3 strength hydrogen peroxide
6 fl oz of ½ strength hydrogen peroxide
question 18 (2.5 points)
a multidose vial of oxacillin 2 g is reconstituted with 8 ml of bacteriostatic water to yield 250 mg/ml. how many ml of the medication should be given if the patient is prescribed 500 mg of the medication?
1 ml
2 ml
3 ml
4 ml

Explanation:

First Question (Hydrogen Peroxide Equivalence)

Step1: Understand the concept of strength

The strength of a solution is the proportion of the solute (hydrogen peroxide here) in the solution. For 8 fl oz of ¼ strength hydrogen peroxide, we need to find the amount of pure hydrogen peroxide or equivalent solutions.

Step2: Calculate the amount of pure hydrogen peroxide in 8 fl oz of ¼ strength

The amount of pure hydrogen peroxide is volume of solution × strength. So, \( 8 \, \text{fl oz} \times \frac{1}{4} = 2 \, \text{fl oz} \) of pure hydrogen peroxide. Now let's check the options:

• Option 1: 1.0 fl oz is less than 2 fl oz, so incorrect.
• Option 2: 2 fl oz of hydrogen peroxide (pure) is equal to the amount we calculated, so this is correct.
• Option 3: For 4 fl oz of 1/3 strength, the amount of pure hydrogen peroxide is \( 4 \times \frac{1}{3} \approx 1.33 \, \text{fl oz} \), not equal to 2 fl oz, so incorrect.
• Option 4: For 6 fl oz of ½ strength, the amount of pure hydrogen peroxide is \( 6 \times \frac{1}{2} = 3 \, \text{fl oz} \), not equal to 2 fl oz, so incorrect.

Step1: Recall the formula for dosage calculation

The formula is \( \text{Volume (mL)} = \frac{\text{Desired Dose (mg)}}{\text{Concentration (mg/mL)}} \)

Step2: Identify the values

Desired dose = 500 mg, Concentration = 250 mg/mL

Step3: Calculate the volume

\( \text{Volume} = \frac{500 \, \text{mg}}{250 \, \text{mg/mL}} = 2 \, \text{mL} \)

Answer:

B. 2 fl oz of hydrogen peroxide

Second Question (Oxacillin Dosage Calculation)