Read e-book online Coulometry in Analytical Chemistry PDF

By G. W. C. Milner, G. M. Phillips and R. J. Magee (Auth.)

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Readings of ammeter A also assist in this initial adjustment of the current. On switching S2 to position (2), the current is caused to flow through the electrolysis cell and the timing device is simultaneously actuated. The current is determined from the voltage drop across the standard resistor R5, which is a 5 or 10 Ω precision resistor depending on the magnitude of the current to be measured. These resistors are also placed in a constant temperature oil bath. Thermostatted standard cells serve as the primary reference of voltage.

ELECTROLYSIS CELLS 49 of halogen to be generated without refilling. The electrolyte compositions for the generation of chlorine, bromine and iodine are 2 M HCl, 0-2 M KBr + I M H2S04, and 0-3 M Kl + 0 1 M H3BO3 + 0-5 M Na2S04 respectively. These workers succeeded in titrating 0*5 mM quantities of arsenite in about 200 ml with iodine, chlorine and bromine with an average error within ±0 · 1 %„ In later work Parsons and Seaman17 modified the above cell for use with a mercury cathode, as shown in Fig.

In its original form this apparatus was designed for the coulometric titration of arsenic with electrogenerated bromine. Two current ranges are provided— 29 30 EQUIPMENT FOR CONSTANT-CURRENT COULOMETRY R sAA/V——— Ò Electrolysis cell FIG. 1. Basic circuit for constant-current coulometric titration. one at 10 mA for the main titration, and the other at 1 mA for the titration in the vicinity of the end point. The voltage source is a 45 V battery and the current is claimed to be stable to ±0 · 1 % over a period of 10 min.

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