Question

A technician is given 120ml of 50% potassium chloride solution and is told to add 300 ml of sterile water to it what will the final percentage concentration be of the solution ?

Answer 1

The final percentage concentration of the solution will be 14.29%.

Step-by-step explanation:

To calculate the final percentage concentration of the solution, we need to calculate the amount of potassium chloride in the final solution. The technician is given 120 ml of 50% potassium chloride solution, which means there is 0.5 * 120 = 60 ml of potassium chloride in the solution. When 300 ml of sterile water is added to it, the total volume of the solution becomes 120 + 300 = 420 ml.

To calculate the final percentage concentration, divide the volume of potassium chloride (60 ml) by the total volume of the solution (420 ml) and multiply by 100:

Final percentage concentration = (60 ml / 420 ml) * 100 = 14.29%