Question

Electrogravimetric determination of Copper:

1. Why the sample solution is blue colored? Why do the electrodes have to be as close as possible?

2. Using your textbook explain why does the experiment take so long?

3. Identify three factors that influence the physical characteristics of an electrolytic deposit.

4. What where the acids used in the acidic digestion? Why the experiment requires a mixture of acids?

rather than a single one?

5. Why is important to avoid mixing acetone with Nitric Acid?

Answer 1

Answer: - 1.) the sample solution is blue colour due to the d. d transition and hence emits blue calow in virible region. the electrodes have to be close as possible because the potential inversly proportional to the clistance of the electrodes. When the electrodes comes clorer with each other the charge tranyer Procers is fast 2 The Electro gravimetric determination of copper takes long time because of electrolysis the concentration af one. increases, simultanourly the other ion concentration dcreases whic pushes the reaction in backward direction. 3) the thrall Factors that Influence the Physical characteristics of an electrody Hic depasit are following. 4 cuorent denuity b) temprature e) Presence of complexing agent 4) HNO₃ and Ha sou acids are 3 are cured before used electroluris the before the acidic digestion takes place. so there acids are ured befare the electrolysis. the experiment requires a mixture of acids. for more repration of component. 2 Acetone mixed with Nilaic aod caure explosions. So it is suportant to avoid mixing acetone with nitric acid