The celery and carrot will most likely become saltier and perhaps more shriveled because of the high concentration of salt in the water solution compared to the low concentration of salt in the solution. The raisin, however, could take two roots, one would be the same as the carrot and celery, but the other one is it would soak up water because of how salty and shriveled the raisin already is.
The piece of carrot will sink to the bottom and turn white my guess, the raisin will stay the same or shrivel up the piece of celery will float to the top
FYI i have never done this so in my hypothisis i think this will help get you an idea of the experiment ok
