Use the References to access important values if aeeded for this question. Enter
ID: 1044249 • Letter: U
Question
Use the References to access important values if aeeded for this question. Enter electrons as e States are not required. If a box is not needed, leave it blank An aqueous Crl solution is electrolyzed under 1 bar pressure using platinum electrodes. (a) Write the half-reactions predicted to occur at the anode and cathode, based on the standard cell potentials given below Standard Reduction Potentials (Volts) at 25 °C 12(8) +2e2 T(aq 0.535 O2(R)+4 H,O(ag) +46 H200) 1.229 2 H200)+2H2(g) +2 O (a) 0.828 Cr (ag)+2Crs) 0.905 Half-reaction at anode:Explanation / Answer
CrI2(aq)contains CrI2 and H2O
CrI2--------------------- Cr+2 + 2 I-
H2O ------------------- H+ + OH-
according to IUPAC convention more SRP electrode acts as cathode.
least SRP electrode acts as anode
Anodic reaction is Cr(s) ----------------- Cr+2(aq) + 2e- Oxidatation reaction
cathodic half reaction 2H2O(l) + 2e- ------------ H2(g) + 2 OH- reduction reaction
Ecell= E0cathode - E0anode
Ecell= -0.828-(-0.905)
Ecell= 0.077V
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