Question

Gire the construction and working of standard hydrogen electrocle chemistry
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Answer 1

Explanation:

Neurons (also called neurones or nerve cells) are the fundamental units of the brain and nervous system, the cells responsible for receiving sensory input from the external world, for sending motor commands to our muscles, and for transforming and relaying the electrical signals at every step in between.

Answer 2

QUESTION :

Gire the construction and working of standard hydrogen electrocle chemistry

ANSWER :

Construction of Standard Hydrogen Electrode

For the construction of standard hydrogen electrode following parts are required –

→ Beaker

→Glass jacket

→Platinum wire

→Platinum black foil (Platinum inert electrode)

→Pure hydrogen gas at 1atm

→HCl solution (1M) to give H+ ions

To construct a standard hydrogen electrode, we take hydrogen chloride solution of 1M in a glass beaker. Now a platinum inert electrode with platinum black foil at one end is immersed in the beaker and a glass jacket is kept on it to prevent entry of oxygen. It has an inlet for pure hydrogen gas (1atm) to enter in the solution. A figure of Standard Hydrogen Electrode is shown below –

In standard hydrogen electrode 1M HCl is taken and hydrogen gas is taken at 1atm pressure and temperature is maintained at 25℃. In these conditions its standard reduction potential and standard oxidation potential is always zero. This is the reason it can be used as a reference electrode.

In standard hydrogen electrodes platinum black foil absorbs or adsorbs hydrogen gas and 1M HCl gives 1M H+ ions. Thus, a redox reaction takes place.

H2 ← → H+

Protection of platinum black foil is must otherwise atmospheric oxygen, arsenic or Sulphur compounds may deactivate it. This is the reason inverted glass jacket is used.

Standard Hydrogen Electrode as anode half-cell and cathode half-cell – standard hydrogen electrode can be attached to another half-cell by using a salt bridge. Standard hydrogen electrode can be used as anode half-cell or cathode half-cell depending on the requirement according to another half-cell. When a standard hydrogen electrode is attached as anode half-cell then oxidation occurs on it. Reaction is given below –

H2 2H+ + 2e-