* LiF is formed from the reaction of a strong base (LiOH) and a weak acid (HF).

* Strong bases and weak acids produce salts that are slightly basic. However, LiF is an exception.

* The fluoride ion (F-) is a weak base, and the lithium ion (Li+) is a weak acid. This means that neither ion significantly affects the pH of the solution.

In conclusion: LiF is a neutral salt because the weak acidic and basic properties of its ions cancel each other out.