sorry but you will either level the floor or the tile job will look like crap & your hard work & money willl be shot.. Floor leveling is a project for a pro..
Yes, if you want uneven and broken tile. You should level the floor first.
A tile installer or tile setter.
If it sits over a cement floor, then no. If it is a nailed down floor, then you can, but you still have to install a cement board.
The recommended thickness of cement board for a tile floor installation is 1/2 inch.
A tile installer or tile setter.
It is certainly possible to tile a floor, but bear in mind, there is much more pressure placed on the floor than on the walls, and floor tile must be laid over a solid cement base, otherwise it is going to crack.
Cement board provides a strong and stable base for tile floors, preventing cracking and shifting. It is moisture-resistant, which helps prevent mold and mildew growth. Additionally, cement board is durable and long-lasting, making it a reliable choice for tile floor installations.
Use petrol or paint tinner...
Green screed by BAL
The first thing you want to do is be sure that the original tile is secure and even. If it is loose, or uneven the new tile may pop out or crack under normal wear and tear. If it is uneven or unsecure you can lay a sub-floor to give the new tile a even base.
You would be putting a permanent floor over a temporary floor & that would not be wise. Might work but if it doesn't you lose it all...
NO! This acid is used on cement . The fumes are HIGHLY toxic.