Quick question, how do you tell which is the cathode, and which is the anode? Is

Question

Quick question, how do you tell which is the cathode, and which is the anode? Is there an easy method to determine this that works every time?

CS) 14 A copper wire is placed in a solution of AgNe3. Is there a reaction? Cu2+(aq) 2e Cu (s) Eored +0.34 anceee Ag (aq)+ e Ag (s) IC +0.80 Cathode A. No, because silver ions cannot oxidize copper. B. No, because silver ions cannot reduce copper. C. No, because a salt bridge must be present. D. Yes, because silver ions can reduce copper. E. Yes, because silver ions can oxidize copper.

Explanation / Answer

To find out this solution (for electrode cell), see The electrochemical series (for reducton potential) for a perticular element. In this listed data, if you compare any two element, the top one alwayes act as anode and other as cathode. Or can say, element with more negative value (or less positive) will act as anode rather than element with less negative (more positive). Eg. Cu vs Ag, Cu is listed above Ag hence, Cu will act as anode (less positive value than Ag and get oxidized easily) and Ag will function as cathode (more positive value and get reduced).

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