A Potentiometric Study of Precipitation
in the (Pb2+frame0H2Pframe1frame2Clframe3) System

V. F. Odyakov and E. G. Zhizhina

Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences,
pr. Akademika Lavrent’eva 5, Novosibirsk, 630090 Russia

Received August 18, 2004

Abstract—Interaction of Pb2+ and H2Pframe4 ions in acetate buffer solutions results in the formation of a precip-
itate with variable composition Pbx(PO4)yAz , where A– is a monovalent anion. In the presence of excess chlo-
ride (the Clframe5 : H2Pframe6 molar ratios from 0.5 to 2.0) in the range 4.10 < equal pH < equal 4.95, the precipitate composition
is approximately formulated as Pb5Cl(PO4)3 (Pb : P = 1.667). In the absence of chlorides, the Pb2+ : H2Pframe7
ratio decreases to 1.56–1.62 during precipitation.

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