A study of the system ZnSo₄ - H₂O at 25⁰C

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1936

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Virginia Agricultural and Mechanical College and Polytechnic Institute

Abstract

From a study of the 25℃ isotherm the following factors are evident:

Two hydrates of zinc sulphate exist at this temperature, the heptahydrate and the monohydrate. The transition point between the ZnSO₄·7H₂O and ZnSO₄·H₂O is given as 22.25% sulphuric acid and 22.81% zinc sulphate. The transition point between the ZnSO₄·H₂O and anhydrous ZnSO₄ is given as 88.08% sulphuric acid and .22% zinc sulphate.

The solubility of the zinc sulphate in the sulphuric acid shows a marked decrease at 46% to 48% sulphuric acid is very low in the 97.25% sulphuric acid having only .03% zinc sulphate.

There was no evidence of an acid salt of zinc sulphate being formed at this temperature.

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