The Standard Hydrogen Electrode (SHE) is a reference electrode used to measure the electrode potential of other electrodes. It consists of a piece of platinum foil coated with finely divided platinum black, immersed in a one molar solution of hydrochloric acid (HCl) while pure hydrogen gas is bubbled through it at one atmosphere pressure. The potential of the SHE is arbitrarily fixed at 0.00 volts, serving as a baseline for comparing the standard electrode potentials of other elements, which are determined by establishing a galvanic cell with the SHE under standard conditions
What is the composition of the Standard Hydrogen Electrode (SHE)?
The SHE consists of a piece of platinum foil coated with finely divided platinum black, immersed in a one molar solution of hydrochloric acid (HCl), with pure hydrogen gas bubbled through it at one atmosphere pressure.
How is the electrode potential of other elements measured?
The electrode potential of an element is measured when it is coupled with the Standard Hydrogen Electrode (SHE) in a galvanic cell.
What role does the platinum foil play in the SHE?
The platinum foil acts as an electrical conductor and facilitates the attainment of equilibrium between the hydrogen gas and its ions in solution.
What is the significance of the SHE in electrochemistry?
The SHE serves as a reference point for comparing the standard electrode potentials of other elements, which are arranged in the electrochemical series.
What is the standard condition for the SHE?
The standard condition for the SHE includes a temperature of 25 °C and a pressure of 1 atmosphere for the hydrogen gas.
Standard Hydrogen Electrode(SHE)
a) 0.76 volts
b) 1.00 volts
c) 0.00 volts
d) -0.76 volts
Answer: c) 0.00 volts
What is the main component used to construct the SHE?
a) Gold foil
b) Copper wire
c) Platinum foil
d) Silver electrode
Answer: c) Platinum foil
In which solution is the SHE immersed?
a) Sodium chloride
b) Sulfuric acid
c) Hydrochloric acid
d) Potassium nitrate
Answer: c) Hydrochloric acid
What gas is bubbled through the SHE?
a) Oxygen
b) Nitrogen
c) Hydrogen
d) Carbon dioxide
Answer: c) Hydrogen
How is the electrode potential of other elements measured?
a) By using a pH meter
b) By establishing a galvanic cell with SHE
c) By direct measurement in air
d) By using a spectrophotometer
Answer: b) By establishing a galvanic cell with SHE