Biochemistry - Water, pH and Macromolecules - Discussion

Discussion :: Water, pH and Macromolecules - Section 1 (Q.No.27)


The dissociation constant of H2O at 25° C is

[A]. 10-14 M
[B]. 1014 M
[C]. 10-7 M
[D]. 107 M

Answer: Option A


No answer description available for this question.

Acj said: (May 15, 2016)  
This would imply that water is VERY BASIC which it is not, the correct answer is C which indicates water is neutral (ph=7).

Mamta Joshi said: (May 23, 2017)  
The dissociation constant depend upon the temperature and pressure. The dissociation constant decreases as the temperature increases.

Sunmathy said: (Jun 14, 2017)  
I don't understand it. Please, Help me!

Ninoschka said: (Nov 28, 2017)  
The dissociation constant is the degree of dissociation of the ions of a molecule. In this case: H+ and OH-.

The Pure water is completely ionized. therefore, has a neutral pH. pH = -log[H+]
7 = -log [H+] therefore, [H+] = 10^-7M.

Selma said: (Dec 27, 2017)  
The Dissociation constant of water Kw = [H+][OH-] = 1 x 10-14.
ie., 10-7 x 10-7.

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