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preface to fifteenth edition

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8.114 SECTION 8<br />

TABLE 8.20<br />

Potentials ofReference Electrodes in Volts as a Function ofTemperature (Continued)<br />

Temp., C 125 150 175 200 225 250 275<br />

1.0M KCl<br />

Ag/AgCl* 0.1330 0.1032 0.0708 0.0348 0.0051 0.054 0.090<br />

1.0M KBr<br />

Ag/AgBr† 0.0048 0.0312 0.0612 0.0951<br />

* Greeley et al., J. Phys. Chem., 64, 652 (1960).<br />

† Towns et al., J. Phys. Chem., 64, 1861 (1960).<br />

The values ofseveral additional reference electrodes at 25C are listed:<br />

Ag/AgCl, satd. KCl 0.198<br />

Ag/AgCl, 01M KCl 0.288<br />

Hg/HgO, 1.0M NaOH 0.140<br />

Hg/HgO, 0.1M NaOH 0.165<br />

Hg/Hg 2 SO 4 , satd. K 2 SO 4 (22C) 0.658<br />

Hg/Hg 2 SO 4 , satd. KCl 0.655<br />

TABLE 8.21 Potentials ofReference Electrodes (in Volts) at 25C for Water–Organic Solvent Mixtures<br />

Electrolyte solution of 1M HCl.<br />

Solvent,<br />

wt %<br />

Methanol,<br />

Ag/AgCl<br />

Ethanol,<br />

Ag/AgCl<br />

2-Propanol,<br />

Ag/AgCl<br />

Ace<strong>to</strong>ne,<br />

Ag/AgCl<br />

Dioxane,<br />

Ag/AgCl<br />

Ethylene<br />

glycol,<br />

Ag/AgCl<br />

Methanol,<br />

calomel<br />

Dioxane,<br />

calomel<br />

5 0.2180 0.2190 0.2190<br />

10 0.2153 0.2146 0.2138 0.2156 0.2160<br />

20 0.2090 0.2075 0.2063 0.2079 0.2031 0.2101 0.255 0.2501<br />

30 0.2003 0.2036<br />

40 0.1968 0.1945 0.1859 0.1972 0.243<br />

45 0.1635 0.2104<br />

50 0.1859 0.158<br />

60 0.1818 0.173 0.1807<br />

70 0.158 0.0659 0.216 0.1126<br />

80 0.1492 0.136<br />

82 0.0614 0.0014<br />

90 0.1135 0.096 0.034<br />

94.2 0.0841<br />

98 0.0215<br />

99 0.103<br />

100 0.0099 0.0081 0.53

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