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Co‐Precipitation of Divalent Cations with KCl or NaCl and the Heterogeneous Nuclei Mechanism of Growth
Author(s) -
Glasner A.,
SkurnikSarig S.,
Zidon M.
Publication year - 1969
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.196900085
Subject(s) - chemistry , precipitation , supersaturation , nucleation , divalent , impurity , crystallization , inorganic chemistry , potassium , salt (chemistry) , sodium , evaporation , chloride , crystal growth , double salt , crystallography , thermodynamics , organic chemistry , physics , meteorology
Potassium chloride and sodium chloride were recrystallized in fractions. Crystallization was effected either by cooling a saturated solution or by isothermal evaporation at reduced pressure. In both cases the active cations (Pb 2+ or Cd 2+ ) in the co‐precipitate can be replaced by non‐active cations or anions in consequent fractions of the salt crystallized. The phenomenon is attributed to heterogeneous nucleation; the active cations readily form impurity centred nuclei as soon as supersaturation is produced in the solution. The non‐active ions are slow to nucleate. Co‐precipitation is the result of crystal growth by impurity centred macro‐nuclei.