Question

9. (a) Describe the difference between galvanic and electrolytic cells (5 pt) (b) Explain why it is generally more preferred to use a three electrode system (composed of working, counter, and reference electrodes) than a two electrode system in electrochemical analysis. Also explain the role of working, counter, and reference electrodes, respectively, in a three electrode system. (10 pt)

Answer 1

ralvanic Cetl Electroly tic cell Sptaneow chemicaul re chionAn eectn'c Cument drives o generates erectric current non- spontaneous rea cton d Clecica enet is converted chemical enerqy s converte 9) Anode is neqaive Cathode is electrede and the tlou elechyode to positive elechrode en erot. IJ Converte to chemicel energy to electrical eneryy Anedeis pasitive and cathode is neqauive asiive eectrede and elechrens came oeforced bthe batter te flow external civcuit from neqaivenen-spantanerom pasithve electrede t negahiva etedrode mrouh ex temal crcuit s) They are U, ed ajo Source 。 and elecroyefinin rn electrochemi cul anal-r ‘is working electrode αnd Reference electrode are use to determinc elechicas behavlour of analyte and for the how much potentia applied on the analyte . chanqe in aeetation potentiel takes place of workin electrode with respect fo Reterence electrode. out of wnich se have to Consid er Potentia of reference electrode IJ Constant. But in cea having tw deechode shows change n value ot reference electrode due to foxma tion of Complete Circuit. F we use three electrode 5q stem then working etectrode Is ue for menitoy beha viof anultte and now Reference elechrode have an fin Constant veulue of potential. AISO we are using counter elechroode which malnteun Current stable oR Censtant pontential in reference lectrode that is working elech ode and Counter elechre d e in working mode and Reherence elechrode ha constant pcten ti value of Reterance etectrode remeins constant. Thir the circult with Carrine Curren. Hence the answer. Hence we are using counher esechede, Due to this potentia