Why is an aqueous solution of NaF basic?

Answer 1

I will dissolve in water to form Na+ and F-

NaF <-> Na+ + F- (

NaF is not particularly soluble at room temperature so it might need some heating.

After this step the F- anion will react with an H2O molecule to create an HF molecule.

F- + H2O <-> FH + OH-

Note that F- like other halogens is not likely to attack an hydrogen molecule, however what make F- unique is that the bond it creates is so strong that once it is made, it is very difficult to break. As a result the FH form will exist in solution and accumulate up to a certain amount(the bond can still be broken however, so it is not a strong base), hence why F- is a weak base unlike other halogen ions which are neutral.

Answer 2

The aqueous solution of NaF is slightly basic.