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preface to fifteenth edition

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ELECTROLYTES, EMF, AND CHEMICAL EQUILIBRIUM 8.133<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 />

Potassium<br />

K e K 2.924<br />

K Hg e K(Hg) ca. 1.9<br />

Praseodymium<br />

Pr 4 e Pr 3 3.2<br />

Pr 3 e Pr 2.35<br />

Promethium<br />

Pm 3 3e Pm 2.42<br />

Pro<strong>to</strong>actinium<br />

PaOOH 2 3H e Pa 4 2H 2 O 0.10<br />

PaOOH 2 3H 5e Pa 2H 2 O 1.19<br />

Pa 4 4e Pa 1.46<br />

Radium<br />

Ra 2 2e Ra 2.916<br />

Rhenium<br />

<br />

ReO4 2H e ReO 3 H 2 O<br />

0.768<br />

<br />

ReO4 4H 3e ReO 2 2H 2 O<br />

0.51<br />

ReO<br />

4 2H 2 O 3e ReO 2 4OH <br />

0.594<br />

<br />

ReO 6Cl 8H 3e 2<br />

4 ReCl6 4H 2 O<br />

0.12<br />

<br />

2ReO4 10H 8e Re 2 O 3 5H 2 O<br />

0.808<br />

ReO 3 2H 2e ReO 2 H 2 O 0.63<br />

ReO 2 4H 4e Re 2H 2 O 0.22<br />

ReCl<br />

6 4e Re 6Cl <br />

0.51<br />

Re e Re 0.10<br />

Rhodium<br />

RhO 2 4H e Rh 3 2H 2 O 1.881<br />

Rh 3 3e Rh 0.76<br />

RhCl<br />

6 3e Rh 6Cl <br />

0.5<br />

Rubidium<br />

Rb e Rb 2.924<br />

Rb Hg e Rb(Hg) 1.81<br />

Ruthenium<br />

RuO 4 e RuO 4 0.89<br />

RuO 4 4H 4e RuO 2 2H 2 O 1.4<br />

RuO 4 8H 8e Ru 4H 2 O 1.04<br />

<br />

RuO e 2<br />

4 RuO4 0.593<br />

2<br />

RuO4 4H 2e RuO 2 2H 2 O<br />

2.0<br />

RuO 2 4H 4e Ru 2H 2 O 0.68<br />

3<br />

Ru(H 2 O) e 2<br />

6 Ru(H 2 O) 6 0.249<br />

3<br />

Ru(NH 3 ) e 2<br />

6 Ru(NH 3 ) 6 0.10<br />

3<br />

Ru(CN) e 4<br />

6 Ru(CN) 6 0.86<br />

Ru 3 e Ru 2 0.249<br />

Samarium<br />

Sm 3 3e Sm 2.30<br />

Sm 3 e Sm 2 1.55<br />

Sm 2 2e Sm 2.67<br />

Scandium<br />

Sc 3 3e Sc 2.03

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