an aqueous solution of NaCl on electrolysis gives H2(g), Cl2(g) and NaOH according to the equation 2Cl- (aq) + 2H2O -----> 2OH- (aq) + H2 (g) + Cl2 (g) A direct current of 25 Ampere with a current efficiency of 62% is passed through 20 litres of NaCl (20% by weight) then, the time taken to produce 1 kg of Cl2 and the molarity of the solution wrt hydroxide ion is?
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2NaCl⇌2Na
+
+2Cl
−
2H
2
O⇌2H
+
+2OH
−
At anode:
2Cl
−
→Cl
2
+2e
−
At cathode :
2H
+
+2e
−
→H
2
Net reaction (8 5 5:)
2NaCl+2H
2
O⇌2OH
−
+H
2
+Cl
2
+2Na
+
1000=
96500
35.5
×25.62×t
t=175374.83sec=48.74hr.
moles of OH
−
=
71
1000
×2
volume =20L
[OH
−
]=
71×20
2000
=1.408M
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