Page 29 - 11-chem-8
P. 29
8.CHEMICAL EQUILIBRIUM eLearn.Punjab
The value of pKw is less than 14 at higher tem peratures i.e. at 400Cand 1000C.
The value of pH normally varies between 0 → 14 at 25°C. Solutions of negative pH and having
values more than 14 are also known. Table (8.5) shows the relationship among [H+],[OH-], pH and
pOH of various solutions.
Table (8.5) Relationship of [H30+], [OH-], pH and pOH
More basic Basic [H3O+] pH [OH-] pOH
Neutral
More acidic Acidic 1x10-14 14.0 1x10 0.0
1x10-13 13.0 1x10-1 1.0
1x10-12 12.0 1x10-2 2.0
1x10-11 11.0 1x10-3 3.0
1x10-10 10.0 1x10-4 4.0
1x10-9 9.0 1x10-5 5.0
1x10-8 8.0 1x10-6 6.0
1x10-7 7.0 1x10-7 7.0
1x10-6 6.0 1x10-8 8.0
1x10-5 5.0 1x10-9 9.0
1x10-4 4.0 1x10-10 10.0
1x10-3 3.0 1x10-11 11.0
1x10-2 2.0 1x10-12 12.0
1x10-1 1.0 1x10-13 13.0
1x10-0 0.0 1x10-14 14.0
The pH values of some familiar aqueous solutions are shown inTable (8.6). This table can
help you to understand the acidic or basic nature of commonly used solutions.
29