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: When a solution containing M(NO3)3 of an unknown metal M is electrolyzed, it takes 74.1 s for a current of 2.00 A to plate out 0.107 g of the metal. The metal is

Problem

When a solution containing M(NO3)3 of an unknown metal M is electrolyzed, it takes 74.1 s for a current of 2.00 A to plate out 0.107 g of the metal. The metal is

Solution

We’re being asked to identify an unknown metal M given that it takes 74.1 s for a current of 2.00 A to plate out 0.107 g of the metal from M(NO3)3 .


Let’s first determine what happens to M3+:

 M(s) must be formed from M3+(aq)
 M3+ needs to gain 3 e- in order to become M(s)


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