Explain's werners theory of co-ordination compounds with
suitable examples?
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Answer:
The important postulates of Werner's theory are as follows: In coordination compounds, the central metal or metal atoms exhibit two types of valency, For Example: The primary valency and the secondary valency. The primary valency corresponds to oxidation state and the secondary valency corresponds to coordinate number.
Explanation:
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Answer:
Werner's theory of coordinate compounds-
In 1893, Werner was the first to propose correct structures for coordination compounds containing complex ions, in which a central transition metal atom is surrounded by neutral or anionic ligands.
Postulates of Werner's Theory-
The central metal or the metal atoms in coordination compounds show two types of valency. They are the primary and secondary valency.
The primary valency relates to the oxidation state and the secondary valency relates to the coordinate number.
The number of secondary valences is fixed for every metal atom. It means that the coordination number is fixed.
The metal atom works towards satisfying both its primary and secondary valencies. Primary valency is satisfied by negative ion whereas secondary valences are satisfied by negative ion or by neutral molecules.
Example-
In CoCl
3
.6NH
3
, the coordination number of cobalt is 6 and NH
3
molecule satisfy all the 6 secondary valencies while Chloride ions satisfy the 3 primary valencies. These are non-directional in character. These chloride ions instantaneously precipitate on the addition of silver nitrate. Thus the total number of ions are 4, i.e., three chloride ions and one complex ion.
In CoCl
3
.4NH
3
, two chloride ions exhibit the dual behaviour of satisfying both Primary and Secondary Valencies. The compound gives a precipitate with silver nitrate corresponding to only one Cl
−
ion and the total number of ions is 2. Hence, we can formulate it as [CoCl
2
(NH
3
)
4
]Cl.
Explanation:
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