Zinc Sulphate
Zinc sulfate is used to supply zinc in animal feeds, fertilizers, toothpaste, and agricultural sprays. Zinc sulfate,[5] like many zinc compounds, can be used to control moss growth on roofs.[6]
Zinc sulfate can be used to supplement zinc in the brewing process. Zinc is a necessary nutrient for optimal yeast health and performance, although it is not a necessary supplement for low-gravity beers, as the grains commonly used in brewing already provide adequate zinc. It is a more common practice when pushing yeast to their limit by increasing alcohol content beyond their comfort zone. Before modern stainless steel, brew Kettles, fermenting vessels and after wood, zinc was slowly leached by the use of copper kettles.
A modern copper immersion chiller is speculated to provide trace amounts of zinc; thus care must be taken when adding supplemental zinc so as not to cause excess. Side effects include “…increased acetaldehyde and fusel alcohol production due to high yeast growth when zinc concentrations exceed 5 ppm. Excess zinc can also cause soapy or goaty flavors.
Application
It is used in agriculture as a weed killer and to give protection against pests; It is used to supply zinc in animal feeds and fertilizers; It is also an important constituent of the precipitating bath in the manufacture of viscose rayon and in electrolyte for zinc plating; It functions as a mordant in dyeing; as a preservative for skins and leather; and as an astringent and emitic in medicine.
| Chemical formula | ZnSO4 |
|---|---|
| Molar mass | 161.44[1] g/mol (anhydrous) 179.47 g/mol (monohydrate) 287.53 g/mol (heptahydrate) |
| Appearance | white powder |
| Odor | odorless |
| Density | 3.54 g/cm3 (anhydrous) 2.072 g/cm3 (hexahydrate) |
| Melting point | 680 °C (1,256 °F; 953 K) decomposes (anhydrous) 100 °C (heptahydrate) 70 °C, decomposes (hexahydrate) |
| Boiling point | 740 °C (1,360 °F; 1,010 K) (anhydrous) 280 °C, decomposes (heptahydrate) |
| Solubility in water | 57.7 g/100 mL, anhydrous (20 °C) (In aqueous solutions with a pH < 5)[2] |
| Solubility | alcohols |
| Magnetic susceptibility | −45.0·10−6 cm3/mol |
| Refractive index (nD) | 1.658 (anhydrous), 1.4357 (heptahydrate) |
| Std molar entropy (S⦵298) | 120 J·mol−1·K−1[3] |
| Std enthalpy of formation (ΔfH⦵298) | −983 kJ·mol−1[3] |
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