Yes
An alkali.
base
NO because it cannot
I'm assuming you mean a salt neutralising an acid or base- This can not actually happen, because a salt is already 'Neutralised' An acid can neutralise a base, and a base neutralise an acid, but when Base+Acid reacts, a salt is formed. Adding a salt to a acid or base solution will only make it salty.
an alkali
by the addition of base
No, becuase, idgaf.
do you neutralise tannic acid
A Nitrate salt depending on what was used to neutralise the acid. E.g. If you used copper to neutralise the nitric acid then copper nitrate would be produced.
add sodium bicarbonate...........
bases can neutralize acids