Monatshefte für Chemie - Chemical Monthly

, Volume 105, Issue 4, pp 726–734 | Cite as

Elektrometrische Untersuchungen über die Geschwindigkeit der Bildung von Cu2S in ammoniakalischen Lösungen von Cu+-Ionen mittels Thioacetamid, 4. Mitt.

  • Maria Pryszczewska
Anorganische, Struktur- und Physikalische Chemie

Electrometric studies of the rate of formation ofCu2S by thioacetamide (TAA) in ammoniacal solution ofCu+-ions


Quantitative studies of the rate of Cu2S-formation by thioacetamide (TAA) were made with the help of the polarographic method of continuous registration at constant potential, and the following equation for the reaction rate between Cu+-ions andTAA in ammoniacal solutions was derived:
$$ - \frac{{d[Cu^I ]}}{{dt}} = k \cdot \frac{{[Cu^I ] \cdot [CH_3 CSNH_2 ]}}{{[NH_3 H_2 O]^{{\raise0.7ex\hbox{$1$} \!\mathord{\left/ {\vphantom {1 2}}\right.\kern-\nulldelimiterspace}\!\lower0.7ex\hbox{$2$}}} \cdot [H^ + ]}}\frac{{^{{\raise0.7ex\hbox{$1$} \!\mathord{\left/ {\vphantom {1 4}}\right.\kern-\nulldelimiterspace}\!\lower0.7ex\hbox{$4$}}} }}{{^{{\raise0.7ex\hbox{$1$} \!\mathord{\left/ {\vphantom {1 {10}}}\right.\kern-\nulldelimiterspace}\!\lower0.7ex\hbox{${10}$}}} }} \cdot \frac{{f_{Cu} }}{{f_{H^{{\raise0.7ex\hbox{$1$} \!\mathord{\left/ {\vphantom {1 {10}}}\right.\kern-\nulldelimiterspace}\!\lower0.7ex\hbox{${10}$}}} } }}$$

The value at 25.0° of the rate constantk is (1.6±0.2)·10−2 mole7/20·litre−7/20·sec−1. The validity of equation (1) has been proved over the pH range 8.5–9.5 and the ammonia concentration of 4.0·10−2–4.0·10−1 mole per litre, by only a small excess ofTAA and moderate reaction rates.


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Copyright information

© Springer-Verlag 1974

Authors and Affiliations

  • Maria Pryszczewska
    • 1
  1. 1.Institut für Allgemeine Chemie der Technischen HochschuleSzczecinPolen

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