Question

What affect will adding salt to water have on the repulsion from a magnet?

Answer 1

http://www.physicsforums.com/showthread.php?t=313119 This will help

Answer 2

hmm well salt dissolves when it is in water and the magnetic force that comes from the salt will slowly attract salt partials unto the magnetic.

This is actually a fun experiment to try out and i recommend you doing this :)