Mixed 2 liters of 5% hydrochloric acid solution, 6 liters of 25% solution and 2 liters

Mixed 2 liters of 5% hydrochloric acid solution, 6 liters of 25% solution and 2 liters of 10% acid solution. The concentration of the resulting solution is.

Step by step we will determine the masses of pure substances in solutions, we will determine the total mass of the pure substance, we will find the total mass of the new solution, and then we will get the percentage of hydrochloric acid:

2 * 0.05 = 0.1 l – the volume of the pure substance in the first solution.

6 * 0.25 = 1.5 l – the volume of pure substance in the second solution.

2 * 0.1 = 0.2 l is the volume of pure substance in the third solution.

0.1 + 1.5 + 0.2 = 1.8 L is the volume of pure substance in a new solution.

2 + 6 + 2 = 10 liters – the volume of the new solution.

1.8 / 10 = 0.18 = 18%.