Sample Problems for LT3

1. 5.00 L of 0.169 M solution of Au2(SO4)3 is electrolyzed with a current of 13.0 amperes for 80.4 minutes. Gold is plated on the cathode. What mass of gold is produced?
2. An aqueous AgNO3 solution has a concentration of 0.1 M. one liter of the solution is electrolyzed by a constant current of 0.10 ampere for 10 hours.
a. What weight of silver metal is deposited at the cathode?
b. What volume of dry oxygen gas, measured at STP, is liberated at the anode?
c. What is the molarity of the silver ion in the solution at the end of the electrolysis?
3. Give the net reaction and half reactions for the electrolysis of molten CoCl¬2 and aqueous CoCl2. (please look up E0red)
4. Review discussion on corrosion.

Electrochemistry Lecture Notes Part 1

C3ElectrochemLecNotes1

First Sem Chem 3 Grades

First Sem Chem 3 Grade

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Breakdown will be available on Nov. 9

Electrochemical Cell

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Study Pointers for Chem 3 Perio

1. MAKE SURE YOU UNDERSTAND ALL CONCEPTS THAT WERE DISCUSSED
 When is a chemical reaction in a state of equilibrium?
 What factors affect a system in equilibrium? How does each factor affect the direction of the reaction, the amount of reactants and products, and the value of Keq?
 What are the different definitions of acids and bases and how do they differ?
 What acid strength trends are followed by binary acids? Oxo/oxyacids?
 Why do aqueous solution of salts exhibit acidic, basic, or neutral properties?

2. MAKE SURE YOU KNOW HOW TO…
 Write Keq expression (Kc and Kp) for homogenous and heterogeneous reaction
 Relate Kc and Kp
 Solve Keq problems
 Determine the direction of a system approaching equilibrium (Q vs. Keq)
 Solve for new Keq when a given reaction is manipulated
 Solve for hydronium and hydroxide concentrations, pH and pOH of strong and weak acids and bases.
 Solve for % ionization/dissociation

Problem Set

Exercises

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