in hydrogen bromide on treating of PdBr2 in HBr soln. with excess NH3 soln. untill dissolving of the first formed red ppte. of (Pd(NH3)4)(PdBr4), forming of a colorless soln.; on addn. of soln. into excess HBr soln., forming of ppte.;; sepn. of formed ppte. from NH4Br on decanting with H2O; purification on dissolving and pptg. for several times; drying in desiccator for several days in vacuum and then at 105 up to 110 °C;;
