Since you\'re diluting the solution to 2.5 times its initial volume, since VM = constant, the final concentration is the initial concentration over 2.5, or .0250/2.5 = .010 M. Solution Since you\'re diluting the solution to 2.5 times its initial volume, since VM = constant, the final concentration is the initial concentration over 2.5, or .0250/2.5 = .010 M..