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preface to fifteenth edition

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8.168 SECTION 8<br />

TABLE 8.36<br />

Conductivityof VeryPure Water at Various Temperatures and the Equivalent Conductances<br />

of Hydrogen and Hydroxyl Ions<br />

Equivalent conductance,<br />

cm 2 · ohm 1 ·<br />

equivalent 1<br />

Temp., C Conductivity, S ·cm 1 Resistivity, M ·cm<br />

0 ,H <br />

0 ,OH <br />

0 0.011 61 86.14 224.1 117.8<br />

5 0.016 61 60.21 250.0 133.6<br />

10 0.023 15 43.21 275.6 149.6<br />

15 0.031 53 31.71 300.9 165.9<br />

18 0.037 54 26.64 315.8 491.6<br />

20 0.042 05 23.78 325.7 182.5<br />

25 0.055 08 18.15 350.1 199.2<br />

30 0.070 96 14.09 374.0 216.1<br />

35 0.090 05 11.10 397.4 233.0<br />

40 0.112 7 8.88 420.0 267.2<br />

45 0.139 3 7.18 442.0 267.2<br />

50 0.170 2 5.88 463.3 284.3<br />

55 0.205 5 4.86 483.8 301.4<br />

60 0.245 7 4.06 503.4 318.5<br />

65 0.291 2 3.43 522.0 335.4<br />

70 0.341 6 2.93 539.7 352.2<br />

75 0.397 8 2.51 556.4 368.8<br />

80 0.459 3 2.18 572.0 385.2<br />

85 0.525 8 1.90 586.4 401.4<br />

90 0.597 7 1.67 599.6 417.3<br />

95 0.675 3 1.48 611.6 432.8<br />

100 0.756 9 1.32 622.2 448.1<br />

150 1.84 0.543<br />

200 2.99 0.334 824 701<br />

250 3.31 0.302<br />

300 2.42 0.413 894 821<br />

Source: Data from T. S. Light and S. L. Licht, Anal. Chem., 59:2327–2330 (1987).<br />

8.7.1 Common Conductance Relations*<br />

Conductivity. The standard unit of conductance is electrolytic conductivity (formerly called<br />

specific conductance) , which is defined as the reciprocal of the resistance [ 1 ] of a 1-m cube of<br />

liquid at a specified temperature [ 1 ·m 1 ]. See Table 8.33 and the definition of the cell constant.<br />

In accurate work at low concentrations it is necessary<strong>to</strong> subtract the conductivityof the pure<br />

solvent (Table 8.34) from that of the solution <strong>to</strong> obtain the conductivitydue <strong>to</strong> the electrolyte.<br />

Resistivity(Specific Resistance)<br />

1<br />

<br />

<br />

[ ·m]<br />

* SI units are in brackets.

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