You can purchase a tool used specifically for scraping grout for about $6.00.
Scrape the grout out arond that piece of tile. Then take a small thin edged chisel, hold it up near the crack and tap the end of the chisel with a lightweight hammer a few times to crack it enough to pop a piece out, big enough to get the chishel up against the side of the exposed tile.
Then gently tap it where the tile meets the wall, until it pops loose. Finish popping the remainder of the piece of cracked tile off. Being careful not to force too much pressure on the chisel, to ensure that you do not damage the surrounding tiles.
Once you have that piece off, apply (pre-mixed) tile mastic to the back of the new piece of replacement tile. Run a trowel across the mastic using a 45 degree angle. Put the tile in place. Let it dry overnight, then regrout the area around the replaced tile.
If the tile is set on concrete board, it may pull some of the top layer of the concrete with it. That's not a big deal. Just fill it back in with tile mastic before setting your replacement tile in place.
If the tile was layed on backerboard or greenboard, no problem with popping out the piece of tile at all. Those two materials will release the tile fairly easily.
There is no way to cover over a crack in the tile. It has to be replaced.
Hope this helps to answer your question.
Scrape the grout out arond that piece of tile. Then take a small thin edged chisel, hold it up near the crack and tap the end of the chisel with a lightweight hammer a few times to crack it enough to pop a piece out, big enough to get the chishel up against the side of the exposed tile.
Then gently tap it where the tile meets the wall, until it pops loose. Finish popping the remainder of the piece of cracked tile off. Being careful not to force too much pressure on the chisel, to ensure that you do not damage the surrounding tiles.
Once you have that piece off, apply (pre-mixed) tile mastic to the back of the new piece of replacement tile. Run a trowel across the mastic using a 45 degree angle. Put the tile in place. Let it dry overnight, then regrout the area around the replaced tile.
If the tile is set on concrete board, it may pull some of the top layer of the concrete with it. That's not a big deal. Just fill it back in with tile mastic before setting your replacement tile in place.
If the tile was layed on backerboard or greenboard, no problem with popping out the piece of tile at all. Those two materials will release the tile fairly easily.
There is no way to cover over a crack in the tile. It has to be replaced.
Hope this helps to answer your question.