Consider a galvanic cell that is set up under standard conditions and allowed to

Question

Consider a galvanic cell that is set up under standard conditions and allowed to react. How many of the following responses are true?

1. The half reaction with the lower standard reduction potential will be found in the anode portion of the cell
2. Electrons are produced spontaneously at the cathode electrode
3. Electrons will flow from the cathode half cell to the anode half cell
4. The mass of the cathode electrode will increase as the galvanic cell approaches being "dead"
5. The salt bridge acts as a second pathway for electrons to flow thereby "completing" the electrical circuit

Explanation / Answer

The following are true statements:

1. The half reaction with the lower standard reduction potential will be found in the anode portion of the cell

4. The mass of the cathode electrode will increase as the galvanic cell approaches being "dead"

Explanation:

Since the anode is the site of oxidation, we are losing solid electrode (dissolving) to produce ions and electrons. Electrons flow through the wire connecting the electrodes and the salt bridge only allows for the exchange of cations/anions. The lower standard reduction potential means it is the most negative, so we would want to “flip this” into an oxidation (i.e. anode) in order for Ecell = positive.

.The above are by definition of a galvanic cell, these can be found at standard text books.

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