SOLVED: To determine the amount of Cu in pentakis (thiourea) dicopper sulfate, it can be obtained by titration using EDTA and using murexide as an indicator. Answer the following questions:a. In the preparation of the solution of pentakis (thiourea) dicopper (I) sulfate for titration, why is conc: HNO3 added? What is the function of HNO3?b. Why is it necessary to add aqNH3 to the solution of pentakis (thiourea) dicopper (I) sulfate before titration with EDTA solution?What is the oxidation state