we offer potassium dichromate. potassium dichromate extra pure k2cr2o7 m.w. 294.18 assay(iodometric) 99.5% maximum limits of impurities: chloride(cl) 0.005% sulphate(so4) 0.01% calcium(ca) 0.005% sodium(na) 0.05% loss on drying(1050c) 0.5% cas no:...