Question

Q2. Consider a solution of an indicator (HIn) with an acid dissociation constant of 1.42x10 5and a molar absorptivities of the indicator species at 430 nm and 570 nm are (HIn in 0.1 M HCl is 6.30x10 and 7.12 x 10') and for (In in 0.1 M NaOH is 2.06x 10 and 9.60 x 10). (5.5 marks) a) What are the concentration of [HIn] and [In] b) Calculate the absorbances at two wavelengths for the dissociation process using 1.00 cm-cells? c) What type of deviations from Beer's law for the unbuffered solutions of the indicator HIn? d) Draw the final relationship (from Beer's law) between the absorbance values were calculated above at various indicator wavelengths and concentrations? Q3. What are the types of Emission Spectra (1.5 marks) Q4. What are the requirements needed for Quantitative absorption methods? (1 mark)

Answer 1

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