posted by m on .
I just to know how to identify the substance that is reduced, the substance that is oxidized, the oxidizing agent and the reducing agent in each reaction.
As (s) + ClO3-(aq) → H3AsO3 (aq) + HClO(aq)
CN-(aq) + MnO4-(aq) → CNO-(aq) + MnO2(s)
C2H5OH + MnO4- → C2H3O2 - + MnO2
You look to see which elements change oxidation state. The loss of electrons is oxidation. The gain of electrons is reduction.
Here is a site that will show you how to determine the oxidation state of elements in their compounds.
Here is some info to get you started.
As changes from zero on the left to +5 on the right.
Cl changes from +5 on the left to +1 on the right.
Tip: Don't change H from +1 or O from -2 unless absolutely necessary.