Answer to Question #201162 in Chemistry for Mark

Question

Identify whether the process is oxidation or reduction. Indicate the number of electrons lost or gained per mole of the reactant

1.     C₂O₄^2-   -     CO₂

2.     CrO₄^2-    -     Cr³⁺

Answer 1

Solution:

1) C₂O₄^2- - 2e^- → 2CO₂ - oxidation process (2 electrons lost)

2) CrO₄^2- + 4H₂O + 3e^- → Cr³⁺ + 8OH^- - reduction process (3 electrons gained)