Class 8, Science, Chapter-11, Lecture-1, Electrolyte (Notes)
ELECTROLYTE:
A compound which furnishes ions in solution state or in fused form and allows electricity to pass through it is called an electrolyte.
Examples:
- Solution of copper sulphate in water
- Solution of Acid in water
- Solution of Base in water
- Solution of Salt in water
- Fused Aluminium Oxide
Copper Sulphate is an Electrolyte.
Reason:
Copper Sulphate furnishes ions when dissolved in water and allows electricity to pass through it.
So, it is an electrolyte.
Aluminium Oxide is an Electrolyte.
Reason:
Aluminium Oxide furnishes ions when in molten state and allows electricity to pass through it.
So, it is an electrolyte.
Distilled Water is NOT an Electrolyte.
Reason:
Distilled water does not contain ions and does not allow electricity to pass through it.
So, it is not an electrolyte.
Tap Water is an Electrolyte.
Reason:
Tap water contains various salts. So it furnishes ions and allows electricity to pass through it.
So, tap water is an electrolyte.
STRONG ELECTROLYTE:
An electrolyte which furnishes more ions in solution state or in fused form and allows more electricity to pass through it is called an electrolyte.
WEAK ELECTROLYTE:
An electrolyte which furnishes less ions in solution state or in fused form and allows less electricity to pass through it easily is called an electrolyte.
ELECTROLYTIC CELL:
A vessel containing electrolyte and two solid conducting rods which is used for carrying chemical reactions by passing electric current is called an electrolytic cell.
COMPONENTS:
- Electrolyte: A solution containing ions
- Anode: Electrode connected to the +ve terminal of battery. (OXIDATION at ANODE)
- Cathode: Electrode connected to the -ve terminal of battery. (REDUCTION at CATHODE)
ELECTROCHEMICAL CELL:
A device which generates electrical current from chemical reaction is called Electrochemical Cell.