standard electrode potential

What does E° represent in electrochemistry

E° is the standard reduction potential measured in volts under standard conditions.

What are the standard conditions for measuring electrode potentials

25 °C 298 K, 1 M electrolyte concentration, and 1 atm gas pressure.

How are half equations written in the SEP table

As reduction half equations with the oxidised species on the left and reduced species on the right.

What happens to reduction potential as you go down the SEP table

It increases from negative to positive values.

What does a more positive E° value indicate

A stronger oxidising agent with a higher tendency to attract electrons.

What does a more negative E° value indicate

A stronger reducing agent with a higher tendency to lose electrons.

Which element is the strongest oxidising agent according to the SEP table

Fluorine.

Which element is the strongest reducing agent according to the SEP table

Li.

How can you identify the anode in a galvanic cell using SEP values

It is the half cell with the lower reduction potential.

How can you identify the cathode in a galvanic cell using SEP values

It is the half cell with the higher reduction potential.

What formula is used to calculate standard cell potential

E°cell = E°reduction − E°oxidation.

What does a positive E°cell value indicate

The reaction is spontaneous in the direction written.

What does a negative E°cell value indicate

The reaction is non spontaneous as written and will occur in the reverse direction.

Why is the standard hydrogen electrode SHE important

It is used as the reference electrode with an assigned E° value of 0 V.

What is one limitation of standard reduction potentials

They only apply under standard conditions and may differ in real systems.

What is the formula used to calculate standard cell potential

E°cell = E°cathode − E°anode.

If E°Cu2+/Cu = +0.34 V and E°Zn2+/Zn = −0.76 V, what is E°cell for a Cu Zn galvanic cell

E°cell = 0.34 − (−0.76) = +1.10 V.

In the same Cu Zn cell, which electrode is the anode

Zinc because it has the lower E°.

In the same Cu Zn cell, which electrode is the cathode

Copper because it has the higher E°.

If E°Ag+/Ag = +0.80 V and E°Cu2+/Cu = +0.34 V, what is E°cell for a Cu Ag cell

E°cell = 0.80 − 0.34 = +0.46 V.

In the Cu Ag cell, which electrode is the anode

Copper.

In the Cu Ag cell, which electrode is the cathode

Silver.

If the calculated E°cell is positive, what does this indicate about the reaction

It is spontaneous in the direction written.

If the calculated E°cell is negative, what does this indicate about the reaction

It is non spontaneous and will occur in the reverse direction.

Why must standard conditions be used when calculating E°cell

To ensure values match the tabulated standard electrode potentials and allow reliable comparisons.