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the concentration of absorbing species in resolution mustn’t change spontaneously. The nature of the transition being observed can also be very important. For example, d-d transitions are within tansition metal complexes and due to this fact not modified by altering the solvent or additions of non-interacting ions. However, the height of the uv spectrum of the iodide ion is determined by the solvent because the transition being recorded is a CTTS transition . Thus by adding say sodium chloride to an aqueous solution of NaI or KI the change in the ionic environment round iodide will cause a shift in its peak place. Such small shifts are usually linear with growing concentration of the added … Read More