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preface to fifteenth edition

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ELECTROLYTES, EMF, AND CHEMICAL EQUILIBRIUM 8.141<br />

TABLE 8.30 Half-Wave Potentialsof Inorganic Materials<br />

All values are in volts vs. the saturated calomel electrode.<br />

Element E 1/2 , volts Solvent system<br />

Aluminum<br />

3 0.5 0.2M acetate, pH 4.5–4.7, plus0.07% azo dye Pon<strong>to</strong>chrome<br />

Violet SW; reduction wave of complexed dye is0.2 V<br />

more negative than that of the free dye.<br />

Antimony<br />

3 <strong>to</strong> 0 0.15 1M HCl<br />

0.31(1) 1M HNO 3 (or 0.5M H 2 SO 4 )<br />

0.8 0.5M tartrate, pH 4.5<br />

1.0; 1.2 0.5M tartrate, pH 9 (wavesnot distinct)<br />

1.26 1M NaOH; also anodic wave (3 <strong>to</strong> 5) at0.45<br />

1.32 0.5M tartrate plus0.1M NaOH<br />

5 0.0; 0.257 6M HCl. First wave (5 <strong>to</strong> 3) starts at the oxidation potential<br />

of Hg; second wave is 3 <strong>to</strong> 0.<br />

5 <strong>to</strong> 0 0.35 1M HCl plus4M KBr<br />

Arsenic<br />

3 <strong>to</strong> 5 0.26 0.5M KOH (anodic wave); only suitable wave<br />

3 0.8; 1.0 0.1M HCl; ill-defined waves<br />

0.7; 1.0 0.5M H 2 SO 4 (or 1M HNO 3 )<br />

Barium<br />

2 <strong>to</strong> 0 1.94 0.1M (C 2 H 5 ) 4 NI<br />

Bismuth<br />

3 <strong>to</strong> 0 0.025(15) 1M HNO 3 (or 0.5M H 2 SO 4 )<br />

0.09 1M HCl<br />

0.29 0.5M tartrate, pH 4.5<br />

0.7 0.5M tartrate (pH 9), wave not well-developed<br />

1.0 0.5M tartrate plus0.1M NaOH, poor wave<br />

Bromine<br />

5 <strong>to</strong> 1 1.75 0.1M alkali chlorides(or 0.1M NaOH)<br />

0.13 0.05M H 2 SO 4<br />

0<strong>to</strong>1 0.0 Wave (anodic) starts at zero; Hg 2 Br 2 forms<br />

Br 0.1 Oxidation of Hg <strong>to</strong> form mercury(I) bromide<br />

Cadmium<br />

2 <strong>to</strong> 0 0.60 0.1M KCl, or 0.5M H 2 SO 4 ,or1M HNO 3<br />

0.64 0.5M tartrate at pH 4.5 or 9<br />

0.81 1M NH 4 Cl plus1M NH 3<br />

Calcium<br />

2 <strong>to</strong> 0 2.22 0.1M (C 2 H 5 ) 4 NCl<br />

2.13 0.1M (C 2 H 5 ) 4 NCl in 80% ethanol<br />

Cerium<br />

3 <strong>to</strong> 0 1.97 0.02M alkali sulfate<br />

Cesium<br />

1 <strong>to</strong> 0 2.05 0.1M (C 2 H 5 ) 4 NOH in 50% ethanol<br />

Chlorine<br />

Cl 0.25 Oxidation of Hg <strong>to</strong> form Hg 2 Cl 2<br />

Chromium<br />

6 <strong>to</strong> 3 0.85<br />

2<br />

<br />

CrO4 <strong>to</strong> CrO2<br />

in 0.1 <strong>to</strong> 1M NaOH<br />

3 <strong>to</strong> 0 0.35; 1.70 1M NH 4 Cl9NH 3 buffer (pH 8–9); 3 <strong>to</strong> 2 <strong>to</strong> 0<br />

3 <strong>to</strong> 2 0.95 0.1M pyridine–0.1M pyridinium chloride

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