There is 4 kg of 10% sulfuric acid solution in the chemical laboratory. How much water must be added

There is 4 kg of 10% sulfuric acid solution in the chemical laboratory. How much water must be added to this solution to make the solution 4%?

1. Determine the mass of sulfuric acid in the solution. We take this mass as a and make up the proportion:

4 kg – 100%, and kg – 10%;

4: a = 100: 10;

a = (4 x 10): 100;

a = 0.4 kg;

2. Determine the mass of the new sulfuric acid solution. We take this mass as a and make up the proportion:

0.4 kg – 4%, and kg – 100%;

0.4 x a = 4: 100;

a = (0.4 x 100): 4;

a = 10 kg;

3. Determine how much water was in the original solution:

4 – 0.4 = 3.6 kg;

4. Determine how much water has become in the new solution:

10 – 0.4 = 9.6 kg;

5. Determine how much water was added to the solution:

9.6 – 3.6 = 6 kg.

Answer: 6 kilograms of water was added to the solution.