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Read e-book online An introduction to electrochemistry PDF

By Samuel Glasstone

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Covered with very thin layers of platinum black, and sometimes smooth electrodes have been used. By making measurements with smooth various at electrodes frequencies and extrapolating the results platinum to infinite frequency, conductance values have been obtained which are in agreement with those given by platinized electrodes; this method is thus available when platinum black must not be used. For the great majority of solutions of simple salts and of inorganic acids and bases it is num the practice to employ electrodes coated with a thin layer of platiblack obtained by electrolysis as already described.

The telephone earpiece must, however, be at ground potential, otherwise the capacity between the telephone coils and the observer will result in a leakage of current. Other sources of leakage are introduced by the use of vacuum-tube R5 R6 vwwywwwsA/ 4-> oscillator and amplifier, and by various unbalanced capacities to earth, etc. The special method of grounding proposed by Jones and Josephs is illustrated in Fig. The bridge circuit resistances the essentially and # as in Fig. i, Fia. 17. Jones and Josephs bridge sistances #6 and #6, with the movable constitute the earthing contact g and the variable condenser C By means device, which is a modified form of the Wagner ground.

The conordinary temperatures, may centration of the strong acid is less than 10~ 4 N, a small correction is necessary and its magnitude may be calculated from the dissociation constant of carbonic acid. " 1 Similarly, with weak acids the correction is unnecessary provided the specific conductance exceeds For more dilute solutions the appropriate correction may be this value. calculated, as mentioned above. The solvent correction to be applied to the results obtained with solutions of bases is very uncertain; the partial neutralization of the alkali by the carbonic acid of the conductance water results in a decrease of conductance, and so the solvent correction should be added, rather than subtracted.

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