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

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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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Problem Details

Decide whether or not Cr dissolves in 1 M HIO3.

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