Electrochemical production of Palladium and its use as indicator electrode

The electrodeposition of palladium from electrolytes containing palladium chloride along with potassium dihydrogen phosphate, sodium fluoride or oxalic acid was studied under a variety of condition. The conditions used were: 1.0 M palladium chloride, 0.15 M potassium dihydrogen phosphate, pH 1.5 at 298 K and current density 0.85 mA cm -2 . The current efficiency was calculated and the crystal structure confirmed by X-ray analysis. Spectrophotometric and chemical analysis reveals that the purity of the metal is better than 99%. Palladium electrode can function satisfactorily as indicator electrode for hydrogen ions in acid-base titrations. Titration of acids with sodium hydroxide and of salts of weak acids with hydrochloric acid showed that palladium can indicate very accurately the end point. The end points coincide to great extent with the visual values with an error not more than ±2%.