H2O is present at a calculated value of 1.0 x 107 moles per liter.
The balance of neutral water molecules and the ions they generate controls the chemistry of aqueous solutions.
H3O+(aq) + 2 H2O(l) + OH- (aq)
1.0 x 10-7 M [H3O+] = [OH-]
As a result, adding an acid to water affects the concentration of both H3O+ and OH- ions. Acids raise the concentration of the H3O+ ion in water since they are a source of this ion. However, the amount to which water dissociates is reduced when an acid is added. As a result, the concentration of the OH- ion significantly drops. The concentration of OH- ions rises as a result of adding a base. The H3O+ and OH- ion concentrations are combined to equal Kw once the system reaches equilibrium. Naturally, the only method to do this is to reduce the concentration of the H3O+ ion.
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