Reducing and oxidizing agents

[Felicia Fong 2G]

Q: The following redox couple forms a galvanic cell which generates a current under standard conditions.
Pt2+/Pt and AgF/Ag, F-
What is the reducing agent? I know that the AgF/Ag,F- is the oxidation reaction, so it must be Ag or F-. How do you tell which one is the reducing agent?

[Cynthia Bui 2H]

The reducing agent is the one that causes another molecule to be reduced, meaning the other molecule GAINS an electron and the reducing agent is the one that gave an electron (or more) up. So, looking at AgF, for it to be neutral, Ag had to be 1+ and it shows when they separate, Ag is neutral, so it gained an electron and was the oxidizing agent.