Question

PRELABORATORY EXCERSICE 1. Using the available texts, describe three mechanisms responsible for the transport of dissolved species to and from an electrode surface. 2. What experimental variables affect concentration polarization in an electrochemical cell? 3. Identify three experimental factors that influence the physical characteristics of an electrolytic deposit. What is an acidic digestion and what it models? Why it is important in this experiment? 5. Why is important to rinse the Cu-coated electrodes with acetone and what precautions are needed to effectively dry them in the oven? 4.

Answer 1

supfore electro de to be from an species of transport dissored which all come 3 mechanisms under mate transport Lasically & involves from a • Diffusion: landom movement of molecules lower concentration migdation, @@ 1 -6 particles in telponte attraction de moremo electrostatic of electric field. • Convection : tilling late at which a It is a paced moren solution is stilled con generally be consolled with corretive contribution & lectant Concentration expeimental variables. & mech Stilling t the electrode's magnitude & electolyte Concentration.

3) faches that enhance the physical charachuria og eleckdytie depost are Caulfent densty: usually best deposits are famed at current densities one less than bent which 0.1 A/cm? temperative there are empredictable presence of complexing agents: Cyanide & armonia complexes often provides the best deposits - 4 Acid digestion is a process in which generally what happens is errally metals will not assure in watel & Sgarie solvents, there the acid digestion process is used for discalving metal into solection & in labothy by eling, these we can analybe / determine the amount of metal & element percent Models: microwave digestion, Hot block digestion , Automated that block. Impetence: It will provide details whether the sample is pwe di not. ie quality 3 yes cu-coated elechode must be linked with the acetone because it to levanove the impurities , & it can be removed with wall also but why a celone means it is ato volatile in nature & it evaplars very quickly, it faltens the day drying. Precautions: Should it but over any ace tome de agonie solvent is present, if present it must be cleaned otherwise Catching of fire will appeal