How much water must be added to 1500 mL of a 6.0 mol/L #CaCl_2# solution to make the concentration of the resulting solution 2.0 mol/L?
You need to add another
The defining relationship for
Here we have a molar quantity of
Now clearly, we cannot get the calcium salt out of solution, but we can add more solvent, more water to dilute it.
And here we can use the old relationship,
So we solve for
And since we began with