A nurse needs 500 mL of normal saline, 0.9% NaCl.The stock solution of NaCl is 18%.How much stock solution should be used to make the normal saline?
A) 0.25
B) 2.5 mL
C) 25 mL
D) 250 mL
E) 2500 mL

Question

Quizplus · Accepted Answer

To make a 0.9% NaCl solution from an 18% stock solution, use the dilution formula: $C_1V_1 = C_2V_2$, where $C_1$ is the concentration of the stock solution, $V_1$ is the volume of the stock solution needed, $C_2$ is the desired concentration, and $V_2$ is the final volume of the solution. Plugging in the values: $18\% \times V_1 = 0.9\% \times 500$. Solving for $V_1$ gives $V_1 = \frac{0.9\% \times 500}{18\%} = 25$ mL.

A Nurse Needs 500 ML of Normal Saline, 0