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. Author manuscript; available in PMC: 2013 Jul 29.
Published in final edited form as: J Dispers Sci Technol. 2012 Dec 7;33(12):1762–1786. doi: 10.1080/01932691.2011.625523

TABLE 1.

Equilibrium constants for dissociation of pure water and the neutral pH values at different temperatures

T (°C) Kw (mol2 dm−6) pH
0 0.114×10−14 7.47
10 0.293×10−14 7.27
20 0.681×10−14 7.08
25 1.008×10−14 7.00
30 1.471×10−14 6.92
40 2.916×10−14 6.77
50 5.476×10−14 6.63
100 51.3×10−14 6.14