To find the concentration of the copper solution, we first need to determine the moles of copper that were dissolved. We can do this using the mass of copper and its atomic weight.moles of Cu = mass of Cu / atomic weight of Cu moles of Cu = 0.25 g / 63.55 g/mol moles of Cu 0.00393 molNow, we need to find the volume of the solution in liters.volume = 50 mL * 1 L / 1000 mL = 0.05 LFinally, we can find the concentration of the copper solution by dividing the moles of Cu by the volume of the solution.concentration of Cu = moles of Cu / volume of solution concentration of Cu = 0.00393 mol / 0.05 L concentration of Cu 0.0786 MSo, the concentration of the copper solution is approximately 0.0786 M.