Question

which of the following is not true of standard reduction potential? select the correct answer below: it is impossible to determine the electrical potential of a single electrode. standard reduction potentials always remain the same even when a half-reaction is multiplied by a factor. the standard against which all reduction potentials are measured, with a potential value of 0 v, involves the reduction of chlorine ions to cl2 gas. the main significance of the standard hydrogen electrode is that it established the zero for standard reduction potentials.

Answer 1

Standard reduction potentials are a measure of the voltage of a reduction half-reaction relative to the hydrogen half-reaction. They are typically listed as reduction potentials and are measured against the standard hydrogen electrode (SHE), which is assigned a potential of 0 V under standard conditions. The statement that is not true of standard reduction potentials is: 'the standard reduction potentials always remain the same even when a half-reaction is multiplied by a factor.'

Step-by-step explanation:

Standard reduction potentials are a measure of the voltage of a reduction half-reaction relative to the hydrogen half-reaction. They are typically listed as reduction potentials and are measured against the standard hydrogen electrode (SHE), which is assigned a potential of 0 V under standard conditions. The statement that is not true of standard reduction potentials is: 'the standard reduction potentials always remain the same even when a half-reaction is multiplied by a factor.' The standard reduction potential is dependent on the stoichiometry of the half-reaction and will change if the reaction is multiplied by a factor.

Answer 2

The incorrect statement about standard reduction potential is that it involves the reduction of chlorine ions to Cl2 gas; the correct reference is the Standard Hydrogen Electrode, which has a potential of 0 V. Option C.

Step-by-step explanation:

The statement that is not true of standard reduction potential in the provided options is: 'the standard against which all reduction potentials are measured, with a potential value of 0 V, involves the reduction of chlorine ions to Cl2 gas.'

The correct reference standard for measuring all reduction potentials is the Standard Hydrogen Electrode (SHE), which has a potential value of exactly 0 V under standard conditions. The SHE is a reference system involving the reduction of hydrogen ions to hydrogen gas, not of chlorine ions to chlorine gas.

All standard reduction potentials are measured with respect to the SHE and are unaffected by the multiplication of a half-reaction by a factor, making the potentials an intensive property. This makes standard reduction potential a valuable means of predicting the direction of spontaneous reactions under standard conditions.

Additionally, the standard reduction potentials are listed with reduction half-reactions even when describing an anodic (oxidation) process. Option C.