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When water dissociates, one of the hydrogen nuclei leaves its electron
behind with the oxygen atom to become a hydrogen ion, while the oxygen
and other hydrogen atoms become a hydroxide ion.
Since the hydrogen ion
has no electron to neutralize the positive charge on its proton, it
has a full unit of positive charge and is symbolized as H+.
hydroxide ion retains the electron left behind and thus has a full unit
of negative charge, symbolized by OH-. The hydrogen ion (proton) does
not wander long by itself before it attaches to the oxygen atom of a
second un-ionized water molecule to form a hydronium ion (H3O +)
Therefore, we can conclude and say that water releases both H+ and OH- in equal ratios. This explains why water has a PH of 7
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