# How much pure water must be mixed with 10 liters of a 25% acid solution to reduce it to a 10% acid solution?

##### 1 Answer

May 30, 2017

15 litres of added water

#### Explanation:

We need to reduce 25% to 10%

Let the amount of acid in the mix be

This gives a final acid content of

The target concentration is 10%

Set

Thus

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Let the total volume of the blend be

We have 10 litres of acid so

Thus the added water is 25-10=15 litres