Question

We start with a 12.0 M stock solution of HCl, but need 2.0

liters (L) of a 1.5 M HCl solution. We will add water to what
volume (V₁) of the stock solution?

Answer 1

4.2 mL

Step-by-step explanation:

To make the problem more interesting, let's assume that you don't know the formula for dilution calculations.

The idea with diluting a solution is that the number of moles of solute will remain constant after the initial solution is diluted. The only thing that changes in such cases is the volume of the solution.