# What volume of 0.35M SrCl_2is needed to make 158 ml of 0.85M SrCl_2 solution?

Normally, ${C}_{1} {V}_{1} = {C}_{2} {V}_{2}$; but here we are NOT DILUTING, and ${C}_{2}$ is MORE concentrated than ${C}_{1}$. We cannot get to ${C}_{2}$ by dilution.