Pure water is defined by
A) its ability to serve as a pH buffer in solutions.
B) an equal number of H+ and OH- ions.
C) a neutral pH of 7, and equal number of H+ and OH- ions, and its ability to serve as a pH buffer in solutions.
D) a neutral pH of 7.
E) a neutral pH of 7 and an equal number of H+ and OH- ions.
Answer: E
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