are u sure ur 10’s not a negative or has a decimal?

pH=-log[H3O+]

we put a – in front of the log to make the answer of the pH positive

ex) say we want to figure out the pH of .1 moles

if we type log,1 we get a -1 and u can’t have a negative on the pH scale but if you type -log.1 you get 1 which is on the scale

ex) what is the hydrogen ion concentration of a solution that has a pH of 3?

10x(a button on ur calculator)= -3 (type in -3)

so it should be 10x=-3

=.001M H+ (and M is moles/Litre)

i dunno if that helped or if i just meaninglessly rambled on. good luck 🙂

hope that helps, I don’t remember how to find it, sorry. Chem days are far behind me

hope this helps