Refferring to figure 2 and 3, define these key words. (a) Electrolyte and electrolysis (b) Identify the process taking place in these figures respectively.
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a) At cathode, H
2
is evolved and at anode O
2
is evolved.
b) At cathode, H
+
ion takes two electron to convert itself into H
2
gas. 2 moles of H
+
gives 1 mole of H
2
.
2H
+
(aq)+2e
−
→H
2
(g)
At anode, OH
−
ion releases two electrons to convert into water and O
2
. 2 mole OH
−
gives 0.5 mole O
2
, i.e why volume of one gas collected at one electron is double of another.
c) Acid is added to make the water conduct electricity as the distilled water is a non-conductor of electricity.
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