How many kinds of ferrous sulfate hydrate or iron sulphate hydrate

Ferrous sulfate, we also call it as iron sulphate would form different hydrate under different temperature in preparation.

Anhydrous ferrous sulphate
Ferrous sulphate monohydrate
Four water ferrous sulphate
ferrous sulfate heptahydrate

Usually, the commonly used ferrous sulphate are ferrous sulphate monohydrate and ferrous sulfate heptahydrate.

Ferrous sulfate monohydrate is grey powder or granular with sizxe 6-12/12-24/20-40mesh. The formula is FeSO4H2O. the main content of ferrous sulfate monohydrate is 91%min, the content of Fe is 30%min. Ferrous sulfate  monohydrate can be used as micro fertilizer to prevent crops from Fe deficiency;

Ferrous sulfate heptahydrate is green or blue Vitriol or powder. The formula is FeSO47H2O. The main content of ferrous sulfate heptahydrate is 98%min. the content of Fe is 19.7%min. Ferrous sulfate heptahydrate another name is iron sulphate heptahydrate. The common usage is in water treatment.

The following picture is belong to Rech Chemical Co. Ltd  http://www.rqsulfates.com

Ferrous sulfate monohydrate

CAS No.: 7720-78-7

MF: FeSO4.H2O

Molecular weight: 278.01

FeSO4. H2O : 91% Min.

Fe: 29.5-30.5% Min.

Pb: 20 ppm Max.

Iron sulphate heptahydrate

   CAS No.: 7782-63-0  

   MF:   FeSO4.7H2O

   FeSO4. 7H2O: 97% Min.

   Fe: 19.7% Min.

   Pb: 20 ppm Max.