A solution contains both copper (II) and nickel (II). The absorbance of this solution at 394 nm is 0.175 while at 810 nm itis 0.975. Given a K810 Ni value of 0.97 L / (mol xcm) and given a K394 Ni value of 5.1 L / (mol xcm), what is the concentration of the nickel (II) ion in the solution?