Posted by **Daniel** on Monday, June 27, 2011 at 10:07am.

How many liters of water should be added to 20 liters of 40% solution of acid to obtain 30% solution?

- Math -
**Henry**, Tuesday, June 28, 2011 at 8:56pm
Acid = 0.4 * 20 = 8 liters.

Water = 0.6 * 20 = 12 lites.

A / (A + W) = 0.30,

8 / (8 + W) = 0.30,

2.4 + 0.3W = 8,

0.3W = 8 - 2.4 = 5.6,

W = 18.7 Liters.

18.7 - 12 = 6.7 Liters of water added.

- Math -
**Gauss**, Saturday, November 19, 2016 at 9:58am
x = liters of water

.40(20) = .30(x + 20)

8 = .30x + 6

8 - 6 = .30x + 6 - 6

2 = .30x

2 / .30 = .30x / .30

6.666 = x (which is also 6 2/3 as a fraction)

6.7 ~ x

6.7 liters of water is needed.

or

Six and two-third liters of water is need to obtain a 30% acid solution.

## Answer This Question

## Related Questions

- algebra - how many liters of water should be added to a 20 liters of 40% acid ...
- math - how many liters of distilled water must be added to 80 liters of 60% acid...
- Algebra 2 - How many liters of water must be added to 8 liters of a 40% acid ...
- algebra - How many liters of a 20% solution of acid should be added to 10 liters...
- Math - A chemist wants to create a solution that is 24% acid. How many liters of...
- journal assignment - how many liters of a 10%solution of acid should be added to...
- math - a chemist wants to create a solution that is 36% acid. How many liters of...
- Math - A chemist wants to create a solution that is 24% acid. How many liters of...
- Algebra - A chemist wishes to mix a solution that is 4% acid. She has on ...
- Math - A chemistry teacher needs 2.5 liters of a sulfuric acid solution that is ...

More Related Questions