Ch.18 - ElectrochemistryWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: For the following electrochemical cellCo(s) | Co2+ (aq, 0.0155 M) || Ag+ (aq, 1.50 M) | Ag(s)Write the net cell equation. Phases are optional. Do not include the concentrations.Calculate the following

Problem

For the following electrochemical cell

Co(s) | Co2+ (aq, 0.0155 M) || Ag+ (aq, 1.50 M) | Ag(s)

Write the net cell equation. Phases are optional. Do not include the concentrations.

Calculate the following values at 25.0°C using standard potentials as needed.

Solution

For a Cobalt-Silver cell with the given diagram, we’re asked to write the net cell equation and to calculate E°cell and Δrxn at 25 °C.

The cell diagram of the process is:

Co(s) | Co2+ (aq, 0.0155 M) || Ag+ (aq, 1.50 M) | Ag(s)

Where

Co(s) is the left-hand electrode

Co2+ is the left-hand cation in the aqueous electrolyte

Ag+ is the right-hand cation in the aqueous electrolyte

Ag is the right-hand electrode


There are two ways to identify the Cathode and Anode:

  • The Cathode is related to the reduction process, and the Anode is related to the Oxidation process.
  • On the cell diagram, the / symbol indicates the phase boundaries or the different phases of an element, while the // symbol indicates the physical boundary between cells. The first phase boundary is our Anode (A), the second the Cathode (C), and the physical boundary is our Break (B).

          A                                 B                           C

  Co(s) | Co2+ (aq, 0.0155 M) || Ag+ (aq, 1.50 M) | Ag(s)


We answer the problem in 5 steps:

Step 1: Balance the charges: add electrons to the more positive side (or less negative side)

Step 2: Balance electrons on the two half-reactions.

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