We can construct innumerable number of galvanic cells on the pattern o

1.	We can construct innumerable number of galvanic cells on the pattern of Daniell cell by taking combi nation of different half cells.(a) What is a galvanic cell?(b) Name the cathode and anode used in the Daniell cell.(c) Name the cell represented by Pt(S), H2(g)/H+(aq).(d) According to convention what is the potential of the above cell at all temperatures?(e) Write the use of the above cell.
Answer» (a) It is a device for converting chemical energy into electrical energy. The decrease in free energy in a spontaneous chemical process appears as elec trical energy. e.g., Daniell cell, (b) A zinc rod dipped in 1 M solution of ZnSO₄ acts as the anode. Here oxidation takes place. A copper rod dipped in 1 M solution of CuSO₄ acts as the cathode. Here reduction takes place.(c) This represents the andard Hydrogen Electrode (S.H.E), when it acts as the anode. (d) According to convention, S.H.E is assigned a zero potential at all temperatures (e) It is used as a primary reference electrode for determining the standard electrode potential of an unknown electrode. The electrode whose standard potential is to be determined is coupled with a reference electrode of known potential i.e., S.H.E to get a galvanic cell. The potential of the resulting galvanic cell is determined experimentally. E = E – E Knowing the potential of one electrode that of the other can be calculated.

We can construct innumerable number of galvanic cells on the pattern of Daniell cell by taking combi nation of different half cells.(a) What is a galvanic cell?(b) Name the cathode and anode used in the Daniell cell.(c) Name the cell represented by Pt(S), H2(g)/H+(aq).(d) According to convention what is the potential of the above cell at all temperatures?(e) Write the use of the above cell.

Answer»

(a) It is a device for converting chemical energy into electrical energy. The decrease in free energy in a spontaneous chemical process appears as elec trical energy. e.g., Daniell cell,

(b) A zinc rod dipped in 1 M solution of ZnSO₄ acts as the anode. Here oxidation takes place. A copper rod dipped in 1 M solution of CuSO₄ acts as the cathode. Here reduction takes place.(c) This represents the andard Hydrogen Electrode (S.H.E), when it acts as the anode.

(d) According to convention, S.H.E is assigned a zero potential at all temperatures

(e) It is used as a primary reference electrode for determining the standard electrode potential of an unknown electrode. The electrode whose standard potential is to be determined is coupled with a reference electrode of known potential i.e., S.H.E to get a galvanic cell. The potential of the resulting galvanic cell is determined experimentally. E = E – E Knowing the potential of one electrode that of the other can be calculated.

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment