Question:
Putting a chametz spoon in a pot of cooking Passover soup. What happens to the soup and pot?
Answer:
If the soup was 60 times the volume of the head of the spoon which you inserted into the soup, which is usually the case for a full pot of soup, the soup and pot remain kosher. This only applies to such a mishap taking place before Pesach.
Sources:
Shulchan Aruch 447:4, Mishna Brura ibid. 21.