Problem 4.1: What is selfionization Why does pure water
From Chapter 4 Problem Set. Level 1: Conceptual Mastery.
Question
What is self-ionization? Why does pure water contain both H⁺ and OH⁻, even though no acid or base has been added?
Answer
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Self-ionization is the process by which water molecules react with one another to form hydronium and hydroxide. One water molecule effectively hands a proton to another, producing H₃O⁺ and OH⁻. The ions rapidly recombine, establishing a dynamic equilibrium. No acid or base is needed. The process arises from water’s own molecular behavior.