Nitric Acid → Palladium nitrate

An organic liquid solution of palladium nitrate was prepared by dissolving 350 g of palladium metal in 500 mL of commercially available concentrated nitric acid. The reaction was stirred overnight and any unreacted metal was removed by filtration. The solution was then standardized. The palladium concentration was determined by weighing a 1 mL aliquot of solution and then firing the aliquot at 1000° C. for 15 minutes. After cooling, the residual metal was weighed and the percent metal of the solution was determined as well as the molarity. The hydrogen ion concentration was determined by complexing the palladium ions with an added 5 g of sodium chloride to a 1 mL aliquot of solution. The hydrogen ions were then titrated with 0.1 molar solution of sodium hydroxide using a pH meter to indicate the endpoint. In a typical experiment, the palladium concentration was about 3.5 molar and the acid concentration was about 1 to 2 molar.

1. customany unreacted metal was removed by filtration
2. concentrationThe palladium concentration
3. customat 1000° C.
4. customfor 15 minutes
5. temperatureAfter cooling
6. concentrationThe hydrogen ion concentration

ORD record

ord-91ee27ff2f3d47cc8f1c32731a89890a

Source dataset

uspto-grants-1987_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04678505