Question

Why cannot we store $$AgNO_{3}$$ solution in copper vessel?

Answer 1

Copper is above silver in the electrochemical series and is thus more reactive than silver.
So, copper displaces silver from silver nitrate. Hence, we cannot store $$AgNO_{3}$$ solution in a copper vessel.

Displacement Reaction taking place in the container:

$$\mathrm{Cu + 2AgNO_3 \to Cu(NO_3)_2 + 2Ag}$$