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Chapter 21: Q21.35 P (page 974)

How is a standard reference electrode used to determine unknownEo half-cell values?

Short Answer

Expert verified

The Standard Hydrogen Electrode (SHE) with Eohalf-cell = 0.0 is the standard reference electrode.

Step by step solution

01

Definition of standard reference electrode

An electrode with a known electrical potential is referred to as a standard reference electrode. The most typical application of a standard reference electrode is to determine the potential of another material in an electrochemical cell.

02

Determining the unknown  Eo half-cell values

The Standard Hydrogen Electrode (SHE) with Eohalf-cell = 0.0 is the standard reference electrode. The SHE is assigned a value greater than O when electrodes force it to serve as an anode. SHE is given a value smaller than when electrodes force her to operate as a cathode

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Most popular questions from this chapter

A voltaic cell is constructed with anAg/Ag+half-cell and aPb/Pb2 +half-cell. The zinc electrode is negative.

(a) Write balanced half-reactions and the overall reaction.

(b) Diagram the cell, labeling electrodes with their charges and showing the directions of electron flow in the circuit and of cation and anion flow in the salt bridge.

Subterranean brines in parts of the United States are rich in iodides and bromides and serve as an industrial source of these elements. In one recovery method, the brines are evaporated to dryness and then melted and electrolyzed. Which halogen is more likely to form from this treatment? Why?

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(a) Write balanced half-reactions and the overall reaction.

(b) Diagram the cell, labeling electrodes with their charges and showing the directions of electron flow in the circuit and of cation and anion flow in the salt bridge

Why are E half-cell values for the oxidation and reduction of water different from E掳 half-cell values for the same processes? In an aqueous electrolytic cell, nitrate ions never react at the anode, but nitrite ions do. Explain.
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