Respuesta :
The calculated concentration of H₂O is 1.0 x 10⁻⁷ moles per liter
The chemistry of aqueous solutions is dominated by the equilibrium between neutral water molecules and the ions they form.
2 H2O(l) →H3O+(aq) + OH-(aq)
[H3O+] = [OH-] = 1.0 x 10-7 M
Adding an acid to water therefore has an effect on the concentration of both the H3O+ and OH- ions. Because it is a source of this ion, adding an acid to water increases the concentration of the H3O+ ion. Adding an acid to water, however, decreases the extent to which water dissociates. It therefore leads to a significant decrease in the concentration of the OH- ion.
As might be expected, the opposite effect is observed when a base is added to water. Because we are adding a base, the OH- ion concentration increases. Once the system returns to equilibrium, the product of the H3O+ and OH- ion concentrations is once again equal to Kw. The only way this can be achieved, of course, is by decreasing the concentration of the H3O+ ion.
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