Calculate cell potentials from standard electrode potentials.

In the subtopic Standard electrode potentials (A-level only), this AQA A-Level Chemistry 7405 learning objective focuses on calculate cell potentials from standard electrode potentials. It belongs to Electrode potentials and electrochemical cells (A-level only), so revision should stay anchored to this exact subtopic rather than drifting into a generic GCSE-level chemistry summary. Approved keywords to use include electrode potential, cell potential. Standard electrode potential. means the measure of the individual potential of a reversible electrode at standard conditions, typically measured against the standard hydrogen electrode Avoid the mistake of students often forget to subtract the standard electrode potentials correctly when calculating the cell potential, leading to incorrect signs or values; instead, to calculate the cell potential (E_cell), use the formula E_cell = E_cathode - E_anode. Substitute the values of the standard electrode potentials for the cathode and anode, then perform the subtraction. For example, if E_cathode = +0.76 V and E_anode = -0.44 V, the calculation would be: E_cell = 0.76 V - (-0.44 V) = 0.76 V + 0.44 V = 1.20 V. Therefore, the cell potential is 1.20 V For exam answers, to calculate the cell potential (E_cell) of an electrochemical cell, use the formula E_cell = E_standard(cathode) - E_standard(anode)