Add time:07/16/2019         Source:sciencedirect.com

The isothermal dehydration of zinc formate dihydrate has been studied thermogravimetrically under various water vapour pressures from 5 × 10−4 to 6 Torr. The rate of dehydration exhibited an unusual dependence upon the water vapour pressure: with increasing water vapour pressure, the rate of dehydration increased at first, passed through a maximum, and then decreased gradually to a constant value. X-ray diffraction analysis indicated that the crystalunity of the dehydrated product, Zn(HCO2)2 is affected by the experimental temperature and the water vapour pressure. The presence of a few water molecules seems to promote recrystallization of the dehydrated product. As recrystallization is accompanied by the formation of wide channels between the dehydrated particles, through which the dissociated water molecules can easily escape, so the dehydration rate seems to increase at first. At higher vapour pressure, the rate of dehydration decreases because of the reverse reaction, caused by atmospheric water molecules.

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