Is it safe to stir 1M AgNO₃ solution with a copper spoon?
Given:
E°(Ag⁺,Ag) = 0.80 V
E°(Cu,Cu²⁺) = −0.34 V

Since E°(Ag⁺, Ag) = +0.80 V is higher than E°(Cu²⁺, Cu) = −E°(Cu, Cu²⁺) = −(−0.34) = +0.34 V, therefore Ag⁺ ions can easily accept electrons from Cu.
In other words, the following reaction will occur:

Cu + 2Ag⁺ ⟶ Cu²⁺ + 2Ag

Hence, 1 M AgNO₃ solution cannot be stirred with a copper spoon.