Standard Electrode Potential (2)

Chemistry

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Standard Electrode Potential (2)

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The standard electrode potential, E° of the cell is measured at standard conditions, namely (2)

Gas pressure of 1 atm or 101 kPa

The standard electrode potential, E° of the cell is measured at standard conditions, namely (3)

Temperature at 25 °C or 298K

The standard electrode potential, E° of the cell is measured at standard conditions, namely (4)

Platinum is used as an inert electrode when a half-cell is not a metal electrod

Standard Hydrogen Electrode (reference electrode to measure the value of standard electrode potential)

The function of platinum(IV) oxide, PtO2 in the standard hydrogen electrode (1)

To increase the surface area of platinum, Pt

The function of platinum(IV) oxide, PtO2 in the standard hydrogen electrode (2)

To adsorb hydrogen gas, H2 so that hydrogen molecules are in closer contact with hydrogen ions, H+ in the solution

The standard hydrogen electrode (1)

Consists of a platinum electrode, Pt dipped into an acid containing 1.0 mol dm−3 of hydrogen ions, H+ and hydrogen gas, H2 at a pressure of 1 atm channelled into the acid

Half equation of the hydrogen half-cell

2H+(aq) + 2e− ⇌ H2 (g)

The standard hydrogen electrode potential, E°

Is given the value of 0.00 V

Way to determine the standard electrode potential, E° zinc

E° Zinc, Zn is obtained when a half-cell consisting of a Zn electrode is dipped into solution containing 1.0 mol dm−3 of zinc ions, Zn2+ while connected to a standard H electrode & a salt bridge

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Standard Electrode Potential (2)

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