Question

a pharmacy technician dilutes a 1 g vial of cefazolin (ancef) to 100 mg/ml. which of the following is the amount of solution the technician should use to compound a 500 mg dose? 2.5 ml 10 ml 0.5 ml 5 ml

Explanation:

Step1: Recall the concentration - amount formula

Concentration $C=\frac{m}{V}$, where $C$ is concentration, $m$ is mass, and $V$ is volume. We need to find $V$, and we can re - arrange the formula to $V = \frac{m}{C}$.

Step2: Identify the values of $m$ and $C$

The desired mass of cefazolin $m = 500$ mg and the concentration $C=100$ mg/mL.

Step3: Calculate the volume

Substitute the values into the formula $V=\frac{m}{C}=\frac{500\text{ mg}}{100\text{ mg/mL}} = 5$ mL.

Answer:

D. 5 mL