How many liters of water must be added to 35 liters of 80% HCl solution
to reduce its strength to 75%?
Ans: 6.53 liters . . . . Wrong!
We concerned with the amount of water to be added.
The amount of water is our concern.
We start with 35 liters of soluton which is 20% water,
. . It contains:. liters of water.
We add liters of water.
The mixture contains:. liters of water. .
We know that the mixture will contain liters of which 25% is water.
. . The mixture contains:. liters of water. .
We just described the final amount of water in two ways.
There is our equation . . .
. . . . . . . . . .