or
Zinc Sulfate, Heptahydrate, ACS Grade; 99.0 to 103.0%; Crystals; LabChem; 500g; Poly Bottle; FW: 297.48g/mol; Zn(NO3)2.6H2O; mp: 100degC; Density: 1,970kg/m3; CAS: 7446-20-0