Chemical Analysis, Quiz 3 Answer Key | Answer Key - Edubirdie

University:
California State University, Northridge
Course:
CHEM 321/L | Chemical Analysis I and Lab
Academic year:

2013
Views:

127

Pages:

2
Author:

empalher79

Chem 321 Quiz 3 1. Name Answer Key For the cell Pt (s) a) H2 (1 atm) H+ ( ? M) NiCl2 (1.0 M) Ni (s) Write a balanced equation for the anode reaction. (2) anode: b) H2(g) X 2H+(aq) + 2e- Write a balanced equation for the cathode reaction. (2) cathode: c) Ni2+(aq) + 2e- X Ni(s) The cell above has a potential of 0.051 V at 25EC. What is the pH of the solution in the left compartment? Calculate the cell potential at 25EC. (8) Ecell = 0.051 V = Eox + Ered = 0.05916 pH + (-0.236 V) pH = 4.85 2. (2) 4.85 What is the oxidation number of carbon in Zn(C2H3O2)2? Show all work. Notice that C is associated with the acetate ion (C2H3O2-) in this ionic compound so you can ignore the Zn2+. Assuming that both carbons have the same oxidation number (call it x), the following relationship applies. 2x + 3(+1) + 2(-2) = -1 Solving this yields x = 0. Chem 321 Quiz 3 3. Name Answer Key Is the following reaction a redox process? If so, what is being oxidized? If not, explain why. (3) CaC2 + 2H2O 6 Ca(OH)2 + C2H2 This is not a redox process. No element is changing oxidation number. DATA Electrode E0 (volts) Ni2+/Ni -0.236

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