Ultrapure Water System
While the pH of pure water is approximated to be 7.0 at 25 °C, the theoretical value is 6.998. Indeed, the dissociation of water and the ionic product for water (Eqs. [2] and [3], Table 1) 1 indicate that 10 –6.998 mol/L of H 3 O + are present in pure water.
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