12. The molar absorption coefficient of the Ni2+ complex with dimethylglyoxil ne in solution at a wavelength of 445 nm is 14500. What is the minimum thickness can be used to determine nickel with an approximate concentration of 110^-6mol/1 if the minimum optical density recorded by the device is 0.01 ? Id, mA

To determine the minimum thickness of the solution required to measure nickel with an approximate concentration of , we can use the Beer-Lambert Law, which states that the optical density (OD) is directly proportional to the concentration of the solution.The Beer-Lambert Law is given by the equation: where:- OD is the optical density,- ε is the molar absorption coefficient,- c is the concentration of the solution, and- l is the thickness of the solution.Given that the molar absorption coefficient (ε) is 14500, the concentration (c) is , and the minimum optical density (OD) recorded by the device is 0.01, we can rearrange the equation to solve for the thickness (l): Substituting the given values: Therefore, the minimum thickness of the solution required to determine nickel with an approximate concentration of is 0.000692 cm.