A pharmacy technician is preparing to compound a prescription that requires 120 mL of a 2% w/v solution of a drug. How many grams of the drug are needed?

Rationale

To prepare a 120 mL of a 2% w/v solution, 2.4 grams of the drug are needed.

A 2% w/v (weight/volume) solution means there are 2 grams of drug in every 100 mL of solution. To find the amount of drug needed for 120 mL, the calculation is straightforward: (2 g / 100 mL) × 120 mL = 2.4 g

A (0.24) YOUR ANSWER

This choice incorrectly calculates the required amount of drug. If 0.24 grams were used, it would imply a significantly lower concentration than 2% for a 120 mL solution, leading to a solution that is not appropriately dosed.

B (2.4) CORRECT

This is the correct amount of drug needed. The calculation shows that for a 2% w/v solution, 2.4 grams is necessary to achieve the desired concentration in 120 mL of solution.

C (12) YOUR ANSWER

This choice overestimates the required amount of drug. At 12 grams, the concentration would be far above 2%, resulting in a much stronger solution than intended for the prescription.

D (24) YOUR ANSWER

Similar to option C, this choice also significantly exceeds the required amount. A 24-gram dose would create an excessively concentrated solution, violating the 2% w/v specification and potentially causing harm.

Conclusion

To accurately prepare a 120 mL solution at 2% w/v, 2.4 grams of the drug is essential. This ensures that the concentration meets the specified requirements for the prescription. Incorrect values, such as 0.24 grams, 12 grams, or 24 grams, would lead to solutions that do not adhere to the required dosing standards, emphasizing the importance of precise calculations in pharmaceutical preparations.

A pharmacy technician is preparing to compound a prescription that requires 120 mL of a 2% w/v solution of a drug. How many grams of the drug are needed?

To prepare a 120 mL of a 2% w/v solution, 2.4 grams of the drug are needed.

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