The measured voltage at standard conditions, 25degree C and concentrations of 1.

Question

The measured voltage at standard conditions, 25degree C and concentrations of 1.0 M for the aqueous ions of the reduction half-reaction is defined as the standard reduction potential, E degree. The more positive (or less negative) the reduction potential, the greater is the tendency for the reduction to occur. Furthermore, the more positive (or less negative) E degree, the greater tendency to be oxidized. Using Table 9-1, list 5 metals below based on increasing E degree values: Using metals in question 3, show the balanced equation between the two metals that would give the largest E degree_cell reading, and identify the half-reaction for anode and cathode. a. Balanced equation: b. Anode half-reaction: c. Cathode half-reaction:

Explanation / Answer

Ans 3.

The elements with positive electrode potentials are good oxidising agents , so their reduced form is more stable . Whereas the elements having negative electrode potential are good reducing agents and so their oxidised forms are more stable .

Order of elements in the order of increasing Eo values are :

Lithium (Li+) < Zinc (Zn2+) < Hydrogen (H+) < Copper (Cu2+) < Cobalt (Co3+)

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