You can remove tile adhesives by taking a hair dryer and move around heating the entire area of the tile. Return to the first corner and hold the hair dryer in place for a few minutes. After you've removed all the tiles, you're left with the adhesive. Remove all of it and if the substantial remains, use a block of dry ice. Place it on top of the adhere, wait until it freezes and quickly use the scraper to remove hard chucks of adhesive.