PH scale help please?

Question

I need help filling out this pH chart. I have no idea what i'm doing here..

http://i131.photobucket.com/albums/p315/gabbyber1/pHchart.jpg

thanks for your help i really appreciate it =)

Answer 1

It means that if

[H+] = 1 M  => pH = - log 1 = 0

because [H+][OH-] = 10^-14 => [OH-] = 10^-14 / 1 = 10^-14 M

if [H+] = 0.1 M => pH = - log 0.1 = 1

and [OH-] = 10^-14 / 0.1 = 10^-13 M

if [H+] = 0.01 M => pH = - log 0.01 = 2

and [OH-] = 10^-14 / 0.01 = 10^-2 M

and so on