pH of Pure Water
The pH of absolutely pure water (100% pure H₂O, no dissolved gases or impurities) is: pH = 7.0 (neutral) at 25 °C Why it is 7.0 Pure water undergoes autoionization: [\text{H₂O} \leftrightarrow \text{H⁺} + \text{OH⁻}] At 25 °C: So: [\text{pH} = -\log(1.0 \times 10^{-7}) = 7.0] Important nuance (often missed) pH of pure water is … Read more