The ionic product of water, also known as the dissociation constant of water or the self-ionization constant of water, is a measure of the degree to which water spontaneously ionizes into hydronium ions (H3O+) and hydroxide ions (OH-) in an aqueous solution. The ionic product of water is given by the equation:
Kw = [H3O+][OH-]
where Kw is the ionic product constant, [H3O+] is the concentration of hydronium ions in moles per liter, and [OH-] is the concentration of hydroxide ions in moles per liter.
At 25°C, the value of Kw for pure water is approximately 1.0 x 10^-14 mol^2/L^2, which means that the concentration of hydronium ions in pure water is equal to the concentration of hydroxide ions. This relationship is expressed by the pH scale, which is a logarithmic measure of the acidity or basicity of a solution. A pH of 7 is considered neutral, as it corresponds to a balanced concentration of H3O+ and OH- ions in the soluti
on.
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