The graphs below show UV-Vis spectra of copper complexes recorded with an optical path length of 1cm (note that different quantities have been plotted for sample 1 and 2).
a)Identify the colour of both (Cu(H2O)6)^2+ and (CuCl4)^2-
b)Find the concentration of (Cu(H2O)6)^2+ in sample 1, given that the molar absorptivity at 810nm is 30.25dm^3 mol^-1 cm^-1
c)What concentration of (CuCl4)^2- would give an absorbance of 1 at a wavelength of 405nm?
d)Calculate the fraction of photons passing through the sample and reaching the detector if the sample has an absorbance of 0.1, 1, 2, 3, 4, respectively
3)
a) Calculate the wavelength, wave number, frequency and energy change for the electronic transition corresponding to the line with the lowest frequency in the Lyman series of the hydrogen emission spectrum. Which part of the electromagnetic spectrum does this line belong to?
b)Comparing the emission and absorption spectrum of hydrogen, do the absorption lines occur at the same wavelength as emission lines? Which lines would be observed in an absorption spectrum at room temperature? Briefly justify your answer.
