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: Decide whether or not Cr dissolves in 1 M HIO3.

Solution: Decide whether or not Cr dissolves in 1 M HIO3.

Problem

Decide whether or not Cr dissolves in 1 M HIO3.

Solution

We’re being asked to determine whether Cr dissolves in 1 M HIO3


To dissolve a metal, the metal goes from its neutral form which is solid to its ionized form which is aqueous. When the metal gains a charge, it becomes aqueous. It means it dissolves within a solution.


M(s) → M+(aq)


Recall the mnemonics

Lose               Gain
Electron         Electrons
Oxidation       Reduction

cathode reduction  oxidation number decreases

anode  oxidation  oxidation number increases

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