Salt cannot be separated from water using a centrifuge or by allowing it to sit because saltwater is a homogeneous mixture, meaning the salt (NaCl) is dissolved in the water rather than being a separate entity. The NaCl does not form distinct molecules but exists as dissociated ions in solution. The concept of density is not applicable to individual ions, and the thermal motion of molecules significantly outweighs gravitational effects, preventing the salt from settling at the bottom. Additionally, the dissolved salt creates a true solution that cannot be filtered out using permeable membranes or filter paper, making separation through centrifugal force ineffective.
