... Magnesium sulfate heptahydrate Magnesium sulfate heptahydrate Molecular Formula: MgSO4nH2O(n=0,1,2,3,4,5,6,7)Molecular Weight: 120 ... .37+18n (n= 0,1,2,3,4,5,6,7)CAS No: 10034 ... .2119.6PH(5% Solution)5.0-9.25.0-9.25.0-9.25.0-9.25.0-9.25.0-9.2Iron(Fe)%max0.00150 ... and dehydration agent of feed and fertilizer. MnSO4.7H2O size 0.1-0.5Magnesium sulfate heptahydrate