o 20 Consider the following voltaic cell (a) In which direction do electrons flo

Question

o 20 Consider the following voltaic cell (a) In which direction do electrons flow in the external circuit? (b) In which half-cell does oxidation occur? (c) In which half-cell do electrons enter the cell? (d)At which electrode are electrons consumed (e) which electrode is negatively charged? (f) Which electrode decreases in mass during cell operation? (g) Suggest a solution for the cathode electrolyte. (h) Suggest a pair of ions for the salt bridge. For which electrode could you use an inactive material? G) In which direction do anions within the salt bridge move to maintain charge neutrality?

Explanation / Answer

(20)

E0Fe2+/Fe = - 0.447 V

E0Ni2+/Ni = - 0.257 V

(a) electrons flow from Fe anode to Ni cathode

(b) Fe/Fe2+ compartment oxidation is occured. Because its reduction potential is less than that of Ni2+/Ni compartment.

(c) At anode. i.e at Fe/Fe2+ compartment electrons enter into the cell.

(d) At cathode electrons are consumed, i.e. at Ni2+/Ni compartment

(e) Fe is negatively cahrged. anode is negatively charged

(f) Anode i.e. Fe is reduced in mass as it undergeos oxidation.

(g) aqueous solution of Ni(NO3)2

(h)K+ and NO3- (KNO3)

(i) For cathode

(j) Towards anode compartment

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