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preface to fifteenth edition

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8.134 SECTION 8<br />

TABLE 8.27<br />

Potentials of the Elements and Their Compounds at 25C (Continued)<br />

Half-reaction<br />

Standard<br />

or formal<br />

potential<br />

Solution<br />

composition<br />

Selenium<br />

2<br />

SeO4 4H 2e H 2 SeO 3 H 2 O<br />

1.151<br />

H 2 SeO 3 4H 4e Se 3H 2 O 0.74<br />

Se(c) 2H 2e H 2 Se(aq) 0.115<br />

Se H 2e HSe 0.227<br />

Se 2e Se 2 0.670 1 NaOH<br />

Silicon<br />

SiO 2 (quartz) 4H 4e Si 2H 2 O 0.909<br />

SiO 2 2H 2e SiO H 2 O 0.967<br />

SiO 2 8H 8e SiH 4 2H 2 O 0.516<br />

SiF<br />

6 4e Si 6F <br />

1.37<br />

SiO 2H 2e Si H 2 O 0.808<br />

Si 4H 4e SiH 4 (g) 0.143<br />

Silver<br />

AgO 2H e Ag 2 H 2 O 1.360<br />

Ag 2 O 3 2H 2e 2AgO H 2 O 1.569<br />

Ag 2 O 3 H 2 O 2e 2AgO 2OH 0.739 1 NaOH<br />

Ag 2 O 3 6H 4e 2Ag 3H 2 O 1.670<br />

Ag 2 e Ag 1.980<br />

AgO 2H e Ag H 2 O 1.772<br />

Ag e Ag 0.7991<br />

Ag 2 SO 4 2e 2Ag SO 2<br />

4 0.653<br />

Ag 2 C 2 O 4 2e 2Ag C 2 O 2<br />

4 0.47<br />

Ag 2 CrO 4 2e 2Ag CrO 2<br />

4 0.447<br />

<br />

Ag(NH 3 ) 2 e Ag 2NH 3<br />

0.373<br />

AgCl e Ag Cl 0.2223<br />

AgBr e Ag Br 0.071<br />

AgCN e Ag CN 0.017<br />

AgI e Ag I 0.152<br />

Ag(CN) e Ag 2CN 0.31<br />

AgSCN e Ag SCN 0.09<br />

Ag 2 S 2e 2Ag S 2 0.71<br />

Sodium<br />

Na e Na 2.713<br />

Na Hg e Na(Hg) 1.84<br />

Strontium<br />

SrO 2 4H 2e Sr 2 2.33<br />

Sr 2 2e Sr 2.89<br />

Sulfur<br />

2<br />

S 2 O 2e 2<br />

8 2SO4 1.96<br />

2<br />

S 2 O 2H 2e <br />

8 2HSO4 2.08<br />

2<br />

2SO 4H 2e 2<br />

4 S 2 O6 2H 2 O<br />

0.25<br />

2<br />

SO4 4H 2e SO 2 (aq) H 2 O<br />

0.158<br />

SO 4 H 2 O 2e SO3 2OH <br />

0.936<br />

2<br />

S 2 O6 4H 2e 2H 2 SO 3<br />

0.569<br />

2<br />

S 2 O 2e 2<br />

6 2SO3 0.037<br />

<br />

2HSO 2H 2e 2<br />

3 S 2 O4 2H 2 O<br />

0.099<br />

2SO 3 2H 2 O 2e S 2 O4 4OH <br />

1.13<br />

4H 2 SO 3 4H 6e 2<br />

S 4 O6 6H 2 O<br />

0.507

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