Acids, bases & salts
Electrolysis — তড়িৎ বিশ্লেষণ
Quick answer
Using electric current to break up an electrolyte; water splits into at the cathode and at the anode.
Definition
Electrolysis uses electricity to split a compound that conducts either as a melt or in solution, called an electrolyte. Current enters through the positive anode and leaves by the negative cathode; ions move to these electrodes and gain or lose electrons, so the process is always a pair of redox reactions. Electrolysis of water gives hydrogen at the cathode and oxygen at the anode in a 2:1 volume ratio. Many pure metals are produced this way.
For example
In your school lab, passing current through acidified water with two test tubes over the electrodes collects on one side and on the other, volume ratio 2:1.