Bromide (Br-) is the conjugate base of hydrobromic acid (HBr).

Here's why:

* Acids donate protons (H+).

* Bases accept protons (H+).

When hydrobromic acid (HBr) dissolves in water, it donates a proton to form a bromide ion (Br-) and a hydronium ion (H3O+):

HBr + H2O → Br- + H3O+

Since bromide (Br-) is formed by the loss of a proton from the acid, it's considered a conjugate base.

Therefore, bromide is a base.