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OF CONTENTS Introduction Kale of nucleation in precipitate formation Methods of precipitation Increase in pH Anion rclease Cation release Reagent synthesis Precipitation from mixed solvcnts Valency change Photochemical action Main group elements Transition elements ,4pplications t o gravimetric analysis Co-precipitation and fractional precipitation Industrial applications Miscellaneous applications Conclusions * Reprints of this paper will be available shortly.* This was drawn t o our attcntion when the paper was in proof.

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The scope of precipitation from homogeneous solution by cation release a t constant pH is limited by the fact that some substances are immediately precipitated a t room temperature when suitable anions are added to solutions containing metal -EDTA complexes. This behaviour has been related to the solubilities of the precipitates and the apparent stability constants of the complexes. Under these conditions, EDTA may be of limited use in the absence of oxidising agents as a masking agent; an example is given in the separation of barium and calcium.* For details of Part I of this series, see reference list, p. 167.f The substance of this paper and other parts of the series was presented a t the meeting of the Society on Wednesday, November lst, 1961. NOTE-Reference3 is to Part I of this series.