Salts, electrolysis, 1 (Salze-85) Copper is obtained electrolytically from Cu2+ – ions. In a electrolytic cells is a Cu2+ -withdrawn solution 30 min with a power intensity of I = 2.5 A electrolytic. Calculate the separated mass m(Cu) at an electrolysis efficiency of 92.5%. Note 1: m/M = I·t/(z·F) Note 2: Assume 100% efficacy in a first step. Note: Identical exercise also in the subject of redox

  Exercise: Salze-85    

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Copper is obtained electrolytically from Cu²⁺ – ions. In a electrolytic cells is a Cu²⁺ -withdrawn solution 30 min with a power intensity of I = 2.5 A electrolytic. Calculate the separated mass m(Cu) at an electrolysis efficiency of 92.5%.
Note 1: m/M = I·t/(z·F)
Note 2: Assume 100% efficacy in a first step.
Note: Identical exercise also in the subject of redox

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Solution:

From m/M = I·t/(z·F) follows:
m = (I·t·M)/(z·F) = (2.5·30·60·63.546) / (2·96485) = 1.48 g
Efficiency of 92.5%: 1.37 grams
Units: [(A·s·g/mol)/(C/mol)], [A] = [C/s]

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