1. State your observations when electric current is passed through acidulated water contained in
a voltmeter, such that each electrode has been covered by a test tube containing water.
11. How will you test the gas evolved?
1. Write an electrochemical equation for the reaction
Answers
Answer:
When electric current is passed through acidulated water, it will produce electrolysis. During this process, water is decomposed into hydrogen and oxygen. The positive ions with some move to cathode while the negative ions will also move to anode. Hydrogen gas will form at cathode
Electrolysis of acidulated water
Explanation:
Electrolysis
It is the process in which the electrolyte breaks up into its ions on passing current .
In Electrolysis of water
Electrolyte : Acidulated water (because acid makes pure water good conductor of electricity )
Electrodes : Carbon electrodes covered with a test tube .
When current is passed the water breaks and as a result hydrogen gas is liberated at cathode and oxygen at anode .
H₂O------------------------> 2H⁺ + O²⁻
Reaction at cathode
2H⁺ + 2e⁻-----> H₂
Reaction at anode
O²⁻ - 2e ---> O₂
The gas evolved can be tested by :
For Oxygen gas : supporter of combustion test
For hydrogen gas : pale blue flame and popping sound
The reaction is given above .
