At 25C Kw conveniently (almost) has the value 1.00x10^-14.
pH and Kw for a neutral solution at different temperatures
T .........pH ......... Kw
0......... 7.47....... 0.114 x 10-14
10....... 7.27....... 0.293 x 10-14
20....... 7.08....... 0.681 x 10-14
25....... 7.00....... 1.008 x 10-14
30....... 6.92....... 1.471 x 10-14
40....... 6.77....... 2.916 x 10-14
50....... 6.63....... 5.476 x 10-14
100..... 6.14....... 51.3 x 10-14
For instance at 10C, a neutral solution has a pH of 7.27, not 7.00.
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At 25C Kw conveniently (almost) has the value 1.00x10^-14.
pH and Kw for a neutral solution at different temperatures
T .........pH ......... Kw
0......... 7.47....... 0.114 x 10-14
10....... 7.27....... 0.293 x 10-14
20....... 7.08....... 0.681 x 10-14
25....... 7.00....... 1.008 x 10-14
30....... 6.92....... 1.471 x 10-14
40....... 6.77....... 2.916 x 10-14
50....... 6.63....... 5.476 x 10-14
100..... 6.14....... 51.3 x 10-14
For instance at 10C, a neutral solution has a pH of 7.27, not 7.00.