Abstract
The hydrolysis of lead and the precipitation of lead hydroxide over a wide pH and concentration range of lead nitrate in 0·5 M sodium perchlorate and lead chloride in 0·15 M sodium chloride have been investigated by tyndallometric method, high voltage electrophoresis and adsorption chromatography on filter paper cellulose. The precipitation diagrams, represented as pH vs log concn of lead salts, show regions where Pb 2+ ionic species, cationic and anionic hydrolytic species, cationic chloro and chloro-hydroxo complexes, and electrically uncharged ion pairs of sodium ions with anionic hydroxo complexes of lead were found to exist. The solubility constant of lead hydroxide log Ks 0 = −19·3 was found at 20°C. The electrical charge of the lead hydrolytic species which form lead hydroxide precipitate at the precipitation boundary was found to be +2, whereas the electrical charge −2, was attributed to polynuclear anionic species formed after dissolution of lead hydroxide precipitate with alkali in excess.
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