Electrochemical cell
Electrochemical cell are those cell that convert
chemical energy into electrical energy or electrical energy into chemical
energy.
Types of Electrochemical Cell:
i)
Electrolytic cell
ii)
Galvanic/Voltanic
cell
i)Electrolytic cell
Definition
Those electrochemical cell in which chemical reaction
is carried out by passing electricity are called electrolytic cell.
Characteristics of Electrolytic cell
- Anode and cathode are present in single electrolytic solution.
- Anode and cathode are connected with source of electricity (cell).
- Anode is connected to positive terminal of cell whereas cathode is connected to negative terminal of cell.
- Salt bridge is absent.
- It involves non-spontaneous reaction.
ii)Galvanic cell
Definition
Those electrochemical cell in which electricity is produced as a result of chemical reaction are Galvanic cell.
Characteristics of Galvanic cell
- Anode and cathode are present in different electrolytic solution.
- Anode and cathode are connected with Voltameter or Galvanometer.
- This instrument measures potential difference across two half cell
- E.M.F of cell can be carried out by using given formula:
- Anode is connected to negatively charged and cathode is positively charged.
- Salt bridge is present. It is U-shaped tube made up of glass. It is filled with KNO3. It’s significance is it generates electrical neutrality across two half cell.
- It involves spontaneous reaction: they have tendency to occur on its own.
E.M.F of cell:
It is basis of determining whether reaction is spontaneous
reaction or not.
Types of Questions:
9)
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