A 0.20 mol sample of \(\ce{MgCl2(s)}\) and a 0.10 mol sample of \(\ce{KCl(s)}\) are dissolved in water and diluted to 500 mL. What is the concentration of \(\ce{Cl-}\) in the solution?

The concentration of \(\ce{Cl-}\) is found by dividing the number of moles of \(\ce{Cl-}\) divided by the total volume.

Both \(\ce{MgCl2}\) and \(\ce{KCl}\) will dissociate into ions in solution.