The salt formed when HBr is neutralized with KOH is potassium bromide (KBr). This is because when an acid (HBr) reacts with a base (KOH), the hydrogen ion (H+) from the acid combines with the hydroxide ion (OH-) from the base to form water (H2O), while the remaining ions from the acid and base combine to form a salt. In this case, the remaining ions are potassium (K+) and bromide (Br-), which combine to form potassium bromide (KBr).