To 0.5 l of 6% potassium chloride solution was added 1.2 l of water. The percentage concentration

To 0.5 l of 6% potassium chloride solution was added 1.2 l of water. The percentage concentration of the resulting solution is equal to

Answer: 1.8%.
Explanation of the solution to the problem: to solve this problem, you must use the following formula:
w = V (solv.v-va) / V (solution), where w is the volume fraction of the solute in the solution, V (solv.v-va) is the volume of the solute, V (solution) is the volume of the solution …
First you need to find the volume of the potassium chloride solute:
V (solution in-va) = w * V (solution) = 0.06 * 0.5 = 0.03 l.
Now we find the percentage of the new solution:
w = V (solution in-va) / V (solution) = 0.03 / (0.5 + 1.2) = 0.018 or 1.8%