![](/img/virseliai/0235-7216.jpg) ISSN 0235-7216
ISSN 2424-4538 (online)
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2009 m. Nr. 1
![](/img/pdf_icon.jpg) Formation of barely soluble compounds in the CuSO4–K4P2O7–H2O system
Albinas PIGAGA, Oksana TIMOFEJEVA, Vidas PAKŠTAS, Rita BUTKIENĖ, Jūratė VAIČIŪNIENĖ
The article deals with barely soluble compounds formed in the CuSO4–K4P2O7–H2O system. The precipitates were analysed by X-ray diffraction (XRD), chemical analysis and FTIR spectroscopy. The results have shown that the formation of barely soluble compounds occurs in the following steps: semiamorphous voluminous precipitate → Cu2P2O7 · 5H2O → Cu3K2(P2O7)2 · 3H2O (Dimorph A) → Cu3K2(P2O7)2 · 3H2O (Dimorph B). A double salt may be formed after some time in the reaction mixture as a result of heterogeneous reaction: 3Cu2P2O7 · 5H2O↓ + H2P2O72– + 4K+ → 2Cu3K2(P2O7)2 · 3H2O↓ + 2H+ + 9H2O. This process has not been described in any previous publications.
Keywords: copper, diphosphates, precipitation, heterogeneous reaction, XRD analysis
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