# If 10 ml of a 9 g/L stock solution of ferric chloride are added to a Hach container that has 5 L of water, what will be the concentration of ferric chloride in the water?

##### 1 Answer

Mar 5, 2017

#### Answer:

The new concentration will be 18 mg/L.

#### Explanation:

We can use the dilution equation to solve this problem.

#color(blue)(bar(ul(|color(white)(a/a) c_1V_1 = c_2V_2color(white)(a/a)|)))" "#

where

We can rearrange this formula to get

#c_2 = c_1 × V_1/V_2#

In this problem,

∴