What is the [OH-] in a solution that has a pOH = 2.28?

pls show work so i get the process

Agas is contained in a thick walled balloon when the pressure changes from 1.21 atm to 2.52 the volume changes from 3.75 l to 1.72 l and the temperature change from 293k to blank k

When a septic tank backs up a goes in to clean it out

How many neutrons does an element have if its atomic number is 50 and its mass number is 166