How do we dilute concentrated hydrochloric acid to give 10% #HCl#?
Carefully, and YOU ALWAYS ADD ACID TO WATER..........You also wear a lab coat and a pair of safety spex..................
The reported concentrations must be:
And thus you add
You add 260 mL of the 38 % acid to enough water to make 1 L.
Let's say you wanted to prepare 1 L of 10 %
You can simply use the dilution formula
#color(blue)(bar(ul(|color(white)(a/a) c_1V_1 = c_2V_2color(white)(a/a)|)))" "#
We can rearrange this formula to get
In your problem,
Thus, you would slowly and carefully add 260 mL of the 38 % acid to about 500 mL of distilled water in a volumetric flask, always swirling gently to make sure that the acid is evenly mixed.
Then you would add more distilled water until the level just reaches the 1 L mark on the flask.