electrochemistry

AIEEE 2015 Answers › Physical Chemistry questions › electrochemistry

An acidic solution of Cu2+ salt containing 0.4 g of Cu2+ is electrolyzed untill all copper is deposited.
The electrolysis is continued seven more times with the colume of the solution kept at 100ml and the current at 1.2 amp.Calculate the volume of gases evolved at NTP during the entire electrolysis.

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Tush Watts ·2009-11-27 05:12:57

Anodic reacn :- 2 H₂O â†’ O₂ + 4 H⁺ + 4e^-

Cathodic reacn :- 2 Cu ²⁺ + 4e^- â†’ 2 Cu

NET ELECTRLYSIS REACN: - 2 Cu ²⁺ + 2H₂0 â†’ 2 Cu + 4H⁺ +O₂

From Faraday's second law,

Wt of O₂Wt of Cu = eq wt of O₂eq wt of Cu

Therefore, wt of O₂= (Wt of Cu) X eq wt of O₂eq wt of Cu
= 0.4 X 831.75
= 0.1008 g
= 0.00315 mol of O2
= 70 . 55 mL of O2 at STP

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