Which of these is the correct equation for the dissociation of water? h2o + h2o+< ==> h2o + oh– h2o + h2o < ==> h3o+ + oh– h2o < ==> h+ + oh– h+< ==> h2o + h2o+ h2o + oh–< ==> h2o+

Option b = H2O + H2O <==> H3O+ + OH–

Explanation:

Dissociation of water:

The water molecule dissociate into the hydroxyl ion and hydrogen ion. The hydrogen ion immediately protonate the other water molecule and form the hydronium ion.

Chemical equation:

H2O + H2O <==> H3O+ + OH–

The equilibrium constant of self ionization of water is given below:

Kw= [H3O+][OH-]

[H3O+] is the concentration of hydronium ion while [OH-] is the concentration of hydroxyl ion.

Kw is called ionic product of water. The value of Kw is 1.0 × 10∧-14  at 25 °C.

The pure water consist of equal concentration of hydroxyl and hydrogen ions. In order to determine the molarity of both ions square root of ionic product (Kw) is taken.

   [OH-]=[H+]= 1.0 × 10∧-7 M

In case of acidic solution concentration f hydrogen ions are greater than hydroxide ions. For example,

HCl when dissociate into water gives H+ and Cl-. The H+ ions increases in solution. The equilibrium is this given by water.

H2O ⇆ H+ + OH-

Reaction is forced to wards left. As a result concentration of hydroxide ions decreases.

In case of base solution like KOH when dissociate it gives K+ and OH -. The concentration of hydroxyl ions increases in this case and concentration of H+ is decreases and ionic product remain constant.

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.