It's possible for a solution to have pH values below zero and above 14, so why is pH commonly described as having a range of only 0-14?

Concerning the 10.0 ml of 0.50 m nacl to 100 ml of solution: when a solution is diluted, does it change the number of moles dissolved?

How do i complete this electrolysis of water lab? i’m at home, so i don’t have the materials, and the lab didn’t properly work and was incomplete at school.

How can one make a supersaturated solution? (apex)