Dissociation+of+HI

The reaction can be expressed as follows: ** 2H2O(l)  **   **  H3O+(aq) + OH-(aq)  ** **  Or   **   ** H2O(l) ** ** H+(aq) + OH-(aq) **  Throughout the reaction, H2O works as both an acid and a base. This characteristic is identified as ** amphoterism. **   Furthermore, the dissociation of water undergoes equilibrium, as the concentrations of H3O and OH produced are identical.  The equilibrium between the reactants and the products of the reaction can be expressed as follows: KC = {[H+][OH -] / [H2O]} The concentration of the reactants and products of the reaction always remains constant at equilibrium, and therefore, if the concentration of one of the molecules in the product side (either H or OH) increases, then the other must decrease in order to remain the reaction at equilibrium.
 * Dissociation ** is the term used to refer to the process in which a molecule is separated into ions. Substances undergo dissociation to different extents; some dissociate very small amounts, such as water, while others undergo a large amount of dissociation. During the dissociation of water, also known as its auto-ionization, H2O acts as both a proton donor and receiver of itself. With this, protons are transferred from a molecule of water to the other, and this process results in the creation of a hydroxide ion (OH) and a hydronium ion (H3O).

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