Understanding Standard Hydrogen Electrode

What is the standard hydrogen electrode (SHE)?

• The standard hydrogen electrode (SHE) is a reference electrode with a potential of 0 volts.

• The SHE is used exclusively in alkaline batteries.

• The SHE has a potential of 1 volt.

• The SHE is an electrode that measures temperature.

Explain the significance of the standard hydrogen electrode in electrochemistry.

• It is used to measure temperature changes in reactions.

• It serves as a catalyst in electrochemical reactions.

• The standard hydrogen electrode is a type of battery.

• The standard hydrogen electrode is significant as a reference point for measuring electrode potentials in electrochemistry.

How is the standard electrode potential of SHE defined?

• 1.23 V under standard conditions.

• -0.76 V under standard conditions.

• 0.00 V under standard conditions.

• 0.45 V at room temperature.

Calculate the standard electrode potential for a half-reaction given the following data: E°(Zn²⁺/Zn) = -0.76 V.

• -1.23 V

• -0.76 V

• -0.50 V

• 0.76 V

Describe how temperature affects the voltage of an electrochemical cell.

• Higher temperatures always decrease the voltage of an electrochemical cell.

• Temperature generally increases the voltage of an electrochemical cell, but extreme temperatures can decrease it.

• Voltage is only affected by the concentration of the electrolyte, not temperature.

• Temperature has no effect on the voltage of an electrochemical cell.

What is the role of the salt bridge in an electrochemical cell?

• The salt bridge generates electricity in the cell.

• The salt bridge acts as a barrier to prevent ion flow.

• The salt bridge is used to store excess electrons.

• The salt bridge allows ion flow to maintain charge balance in an electrochemical cell.

How do you determine the overall cell potential from standard electrode potentials?

• E°cell = E°cathode - E°anode

• E°cell = E°cathode * E°anode

• E°cell = E°anode + E°cathode

• E°cell = E°anode / E°cathode

Explain the concept of reduction potential in the context of SHE.

• Reduction potential measures temperature changes in a reaction.

• SHE is a type of chemical reaction that produces energy.

• Reduction potential is only relevant in acidic solutions.

• Reduction potential is a measure of a species' ability to gain electrons, with SHE as the reference point at 0 V.

What are some practical applications of the standard hydrogen electrode in laboratory settings?

• Measuring temperature in chemical reactions

• Practical applications of the standard hydrogen electrode include pH measurement, calibration of other electrodes, and determining standard electrode potentials.

• Calculating the density of gases

• Determining the color of solutions