20. Electrochemistry
Standard Reduction Potentials
7PRACTICE PROBLEM
Use the following data to identify which is the stronger reducing agent: AsO43–(aq) or PO43–(aq).
AsO43–(aq) + 2 H2O(l) + 2 e– → AsO2–(aq) + 4 OH–(aq) E°red = –0.71 V
PO43–(aq) + 2 H2O(l) + 2 e– → HPO32–(aq) + 3 OH–(aq) E°red = –1.05 V
Use the following data to identify which is the stronger reducing agent: AsO43–(aq) or PO43–(aq).
AsO43–(aq) + 2 H2O(l) + 2 e– → AsO2–(aq) + 4 OH–(aq) E°red = –0.71 V
PO43–(aq) + 2 H2O(l) + 2 e– → HPO32–(aq) + 3 OH–(aq) E°red = –1.05 V