Copper(II) forms a 1:1 complex with the organic complexing
agent R in acidic medium. The formation of the complex can be monitored by
spectrophotometry at 480 nm. Use the following data collected under
pseudo-first-order conditions to construct a calibration curve of rate versus
concentration of R. Find the concentration of copper(II) in an unknown whose
rate under the same conditions was 6.2 10-3 A s-1 .