Halogenated derivatives of Bi0H10-2 and 2 2-2 have been prepared by reaction of these anions with chlorine, bromine, or iodine and by reaction of Bi2HI2-2 with hydrogen fluoride, hydrogen chloride, or fluorine. These derivatives are exceedingly resistant toward thermal degradation and chemical attack.

General Radio Type 1231-B amplifier and null-detector. Conductivity cells were immersed in an oil thermostat maintained at 25 ± 0.002°, the temperature of which was checked periodically with a calibrated resistance thermometer.

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