There is a soda solution weighing 400 grams, the soda content of which is 15%.

There is a soda solution weighing 400 grams, the soda content of which is 15%. How much water must be added to this solution so that the soda content in the new solution is 2%

Find the mass of soda in the initial solution.

To do this, multiply 400 grams by the percentage of soda.

Will be:

400 * 15% / 100% = 400 * 0.15 = 60 grams.

We find a new mass of solution.

To do this, divide 60 grams of soda by 2%.

As a result, we get:

60/2% = 60 / 0.02 = 3000 grams.

Determine the mass of water to be added to the initial solution.

To do this, subtract the initial weight from the new mass of the solution.

Will be:

3000 – 400 = 2600 grams.

Answer: It is necessary to add 2600 g of water.