1.
a)
[H3O+] = 10la-5 = 10la-pH
=> pH = 5
pH + pOH = 14 => pOH = 9
b)
[HO-] = 10la-5 = 10la-pOH
=> pOH = 5
pH + pOH = 14 => pH = 9
c)
[H3O+] = 10la-7 = 10la-pH
=> pH = 7
pH + pOH = 14 => pOH = 7
2.
a)
[H3O+] = 10la-5
[H3O+] * [HO-] = 10la-14
=> [HO-] = 10la-9
b)
[HO-] = 10la-5
[H3O+] * [HO-] = 10la-14
=> [H3O+] = 10la-9
c)
[H3O+] = 10la-7
[H3O+] * [HO-] = 10la-14
=> [HO-] = 10la-7
3.
a) pH = 5 => solutie acida
b) pH = 9 => solutie bazica
c) pH = 7 => solutie neutra