Question

Name: Experiment 9 Electrochemistry Prelab Questions 20 points possible Due dote: Section (day&time): Instructor 1. We will be building a Cuand Zn2+ galvanic cell. Write the two half reactions (one as a reduction and one as an oxidation based on forming a spontaneous reaction) and write the combined reaction. (Similar to equations 9.3-9.5 but for our system specifically). (3 pts) 2. In the galvanic cell we are building in class, which is the anode and which is the cathode? (2 pts) 3. Calculate Ece for our voltaic cell. (Use Table 16.1 in your OpenStax (Atoms First) textbook) (2 pts)

Answer 1

1. Oxidation half reaction : Zn $\rightarrow$ Zn²⁺ + 2 e

Reduction half reaction : Cu²⁺ + 2 e $\rightarrow$ Cu

Combined reaction : Cu²⁺ + Zn $\rightarrow$ Zn²⁺ + Cu

2. Anode : Zn

Cathode : Cu

3. E_cell = E⁰_Cu2+/Cu - E⁰_Zn2+/Zn = +0.337 - (-0.763) = + 1.100 V