Question

sample question.
a pharmacy technician has 500 ml of a 15% saline solution. how much water should they add to dilute the solution to 5% strength?
a. 1000 ml
b. 750 ml
c. 1500 ml
d. 1250 ml

Explanation:

Step1: Find the amount of salt

The initial solution is \(500\) mL of \(15\%\) saline. The amount of salt is \(0.15\times500 = 75\) mL.

Step2: Set up equation for new concentration

Let \(x\) be the amount of water added. The new volume is \((500 + x)\) mL and the concentration is \(5\%\). So, \(0.05\times(500 + x)=75\).

Step3: Solve the equation

$$
LATEXBLOCK0
$$

Answer:

A. \(1000\) mL