What is the anode in an alkaline battery?? ------ Describe the electrodes in thi

Question

What is the anode in an alkaline battery??

------

Describe the electrodes in this nickel-copper galvanic cell.

a. Drag the appropriate items to their respective bins.

anode cathode gains mass loses mass

Nickel                                             Copper

b. The standard reduction potential for a substance indicates how readily that substance gains electrons relative to other substances at standard conditions. The more positive the reduction potential, the more easily the substance gains electrons. Consider the following:

Ni2+(aq)+2eNi(s),Cu2+(aq)+2eCu(s),   Ered=0.230 V   Ered=+0.337 V

What is the standard potential, Ecell , for this galvanic cell? Use the given standard reduction potentials in your calculation as appropriate!

Explanation / Answer

1) Alkaline batteries are a type of primary batteries dependent upon the reaction between zinc and manganese dioxide

anode is Zn

anode reaction : Zn (s) -------------------> Zn+2 (aq) + 2e-

2)

in Nickel -copper cell electrodes are Ni rod and Cu rod

Ni electrode dipped in Ni+2 solution

Cu electrode dipped in Cu+2 solution

(A)

anode :   Ni

at anode oxidation takes place ; Ni (s) ---------------> Ni+2 (aq) + 2e-

cathode : Cu

at cathode reduction takes place : Cu+2 (aq) + 2e- ----------------> Cu(s)

(B)

E0cell= E0cathode- E0anode

E0cell= E0Cu+2/Cu- E0Ni+2/Ni

          = 0.337 - (-0.230)

          = 0.567 V

E0cell= 0.567 V

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