What is the standard electrode potential of the standard hydrogen electrode, and why is it used as a reference?

The standard electrode potential of the standard hydrogen electrode is defined as 0 V. It is used as a reference because it provides a baseline for comparing the electrode potentials of other half-cells. This answer is anchored to Standard electrode potentials (A-level only).

The standard electrode potential of the standard hydrogen electrode is defined as 0 V. It is used as a reference because it provides a baseline for comparing the electrode potentials of other half-cells. is the best answer because it directly supports the AQA A-Level Chemistry objective to required practical: measure the EMF of an electrochemical cell. This reasoning is anchored to Standard electrode potentials (A-level only) in Electrode potentials and electrochemical cells (A-level only), and it separates electrochemical cell from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.