Werner's theory limitations in full detail
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Answer:
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Explanation:
Werner’s Theory
Alfred Werner in 1898 proposed Werner’s theory explaining the structure of coordination compounds.
Werner’s Experiment: By mixing AgNO3 (silver nitrate) with CoCl3·6NH3, all three chloride ions got converted to AgCl (silver chloride). However, when AgNO3 was mixed with CoCl3·5NH3, two moles of AgCl were formed.
Further, on mixing CoCl3·4NH3 with AgNO3, one mole of AgCL was formed. Based on this observation, the following Werner’s theory was postulated:
Postulates of Werner’s Theory
The central metal atom in the coordination compound exhibits two types of valency, namely, primary and secondary linkages or valencies.
Primary linkages are ionizable and are satisfied by the negative ions.
Secondary linkages are non-ionizable. These are satisfied by negative ions. Also, the secondary valence is fixed for any metal and is equal to its coordination number.
The ions bounded by the secondary linkages to the metal exhibit characteristic spatial arrangements corresponding to different coordination numbers.