A voltaic cell similar to that shown in the figure above is constructed. The ele

Question

A voltaic cell similar to that shown in the figure above is constructed. The electronic device shown at the top of the figure is a volt meter. One electrode compartment consists of a cobalt strip placed in a 1.0 M CoCl3 solution, and the other has a lead strip placed in a 1.0 M Pb(NO3)2 solution.

The overall cell reaction is:

3 Pb(s) + 2 Co3+(aq) 3 Pb2+(aq) + 2 Co(s)

(a) Fill in the information necessary to complete the half reactions that occur in the two electrode compartments. Use the lowest-possible whole-number coefficients. To input an ion surround the ion's element symbol with square brackets and put the ion's charge to the right like this:

Al3+ = [Al]3+ (not [Al]+3), and Li+ = [Li]+ (not [Li]1+ or [Li]+1). Do not use brackets for neutral species.

Anode half reaction: _____(s) _____(aq) + _____e-

Cathode half reaction: _____(aq) + ___e- _____(s)

(b) Figure out which electrode is the anode, which is the cathode, the signs on these electrodes, the direction in which the electrons flow through the volt meter, and the direction in which cations and anions migrate through the salt bridge and solutions. Use this work to pick all of the statements from below which are true.

(A)Electrons flow from the cobalt electrode to the lead electrode through the volt meter.

(B)Cations migrate from the 1.0 M CoCl3 solution through the salt bridge to the 1.0 M Pb(NO3)2 solution.

(C)The lead electrode is the anode and the cobalt electrode is the cathode.

(D)The lead electrode is positive and the cobalt electrode is negative.

(E)The cobalt electrode is positive and the lead electrode is negative.

(F)Electrons flow from the lead electrode to the cobalt electrode through the volt meter.

(G)Cations migrate from the 1.0 M Pb(NO3)2 solution through the salt bridge to the 1.0 M CoCl3 solution.

(H)Anions migrate from the 1.0 M CoCl3 solution through the salt bridge to the 1.0 M Pb(NO3)2 solution.

(I)The cobalt electrode is the anode and the lead electrode is the cathode.

(J)Anions migrate from the 1.0 M Pb(NO3)2 solution through the salt bridge to the 1.0 M CoCl3 solution.

Explanation / Answer

Anode half reaction: Co ------------------------ [Co]2+ +2e V= 0.28v

Cathode half reaction: [Pb]2+ +2e -------------------Pb V = -0.13v

electron going to Co to Pb

are true

A,D,G,H,I

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.