Where the ions in brackets [] represent the concentration in moles per litre. For more help in lonization of water click the button below to submit your homework assignment. Submit Assignment Now! Your Registration is Successful. Please login and proceed with profile update. Water is thus termed amphiprotic , meaning that it can behave as either an acid or a base, depending on the nature of the other reactant.
In pure water, a very small fraction of water molecules donate protons to other water molecules to form hydronium ions and hydroxide ions:. This type of reaction, in which a substance ionizes when one molecule of the substance reacts with another molecule of the same substance, is referred to as autoionization. Thus the number of dissociated water molecules is very small indeed, approximately 2 ppb.
In pure water, the concentrations of the hydronium ion and the hydroxide ion are equal, and the solution is therefore neutral. The autoionization of water yields the same number of hydronium and hydroxide ions.
It is important to realize that the autoionization equilibrium for water is established in all aqueous solutions. Adding an acid or base to water will not change the position of the equilibrium. We are America's leading supplier of high quality drinking water systems and information source.
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