The main differences between zinc sulfate monohydrate and zinc sulfate heptahydrate lie in their form, water solubility, zinc content and uses:

 form:
 Zinc sulfate monohydrate is a white fluid powder that deliquesces easily in the air.
 Zinc sulfate heptahydrate is a colorless orthorhombic crystal, granule or powder with good water solubility.
 Water solubility:
 Although zinc sulfate monohydrate is easily soluble in water, it is partially converted into zinc sulfate pentahydrate during the dissolution process, so the dissolution rate is not as fast as zinc sulfate heptahydrate.
 Zinc sulfate heptahydrate has a structure containing seven water molecules, so it has good water solubility and can be quickly dissolved in water.
 Zinc content:

 The zinc content of zinc sulfate monohydrate is usually higher than that of zinc sulfate heptahydrate. Specifically, the zinc content of zinc sulfate monohydrate is about 34.5%, while the zinc content of zinc sulfate heptahydrate is usually more than 21%.
 Zinc sulfate heptahydrate contains more crystal water and free water, so although its zinc content is high, it is difficult to separate free zinc, so the actual usable part is less.
 use:

 Zinc sulfate monohydrate is mainly used as a raw material for the manufacture of zinc barium and other zinc salts. It is also an important auxiliary raw material for viscose fiber and vinylon fiber, and is used as a trace element fertilizer in agriculture.  135
 Zinc sulfate heptahydrate is used to make lithopone and is used as a mordant, astringent, wood preservative, etc.

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