The Precipitation of Sparingly Soluble Metal Salts Factors Affecting Crystal Form and Anisometry (II)

摘要: This paper describes studies on the factors that determine crystal form and anisometry of sparingly-soluble metal acetates, benzoates, oximates “oxinates” precipitated from aqueous solution: previous phenylarsonate precipitates also examined. Generally, needle-shaped fibrous crystals are formed by organic salts chelates with larger divalent atoms (radius > 1.3 A) cations 0.8 cadmium, lead, copper; nickel glyoxime. The (p) studied is enhanced precipitation at low salt concentration (c) – supersaturation, s = 1 to 10 –, reduced pH solvent solutions containing 50 per cent polar solvents. p varies c according relation, p1c−x. The lead preferential growth onto one face hence discussed.