THE RATE OF DEHYDRATION OF COPPER SULPHATE PENTAHYDRATE AT LOW PRESSURES OF WATER VAPOR

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Abstract
The rate of dehydration of copper sulphate pentahydrate has been determined over a range of low pressures of water vapor. It has been found that as the pressures are increased, the rate at first drops very rapidly; this drop is followed by a period of marked acceleration, which is followed in turn by a gradual decline. Copper sulphate pentahydrate has been found to be similar in this respect to manganous oxalate dihydrate, which has been hitherto regarded as unique in its behavior. The observed effects are probably due to amorphous to crystalline transitions occurring during induction periods, the durations of which have also been found to depend on water vapor pressure.

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