A redox reaction equation is one in which a specie looses electrons and another specie gains electrons.
Redox reaction is a give and take process. One chemical specie loose electrons to be accepted by another chemical specie.
In this case, copper looses electrons as follows;
[tex]Cu(s) -----> Cu^2+(aq) + 2e[/tex]
Silver gains electrons as follows;
[tex]2Ag^+(aq) + 2e ------> 2Ag(s)[/tex]
Overall redox balanced ionic equation;
[tex]Cu(s) + 2Ag^+(aq) ------>Cu^2+(aq) + 2Ag(s)[/tex]
We can see from the overall equation that electrons are transferred from copper to silver.
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