Werner's Theory Of Coordination Compounds
Chapter Name : Coordination Compounds |
Sub Topic Code : 102_12_09_01_01 |
Topic Name : Werner's Theory Of Coordination Compounds |
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Sub Topic Name : Werner's Theory Of Coordination Compounds |
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Introduction
·
In coordination compounds metals show two types
of linkage(valences)-primary and secondary.
·
Primary
valences are ionisable and are satisfied by negative ions.
·
Secondary
valences are non ionisable. They are satisfied by neutral molecules or negative
ions. Secondary valence is equal to the coordination number and is fixed for a
metal.
The ions/groups bound by the secondary
linkages to the metal have characteristic spatial arrangements corresponding to
different coordination numbers.
Pre-Requisites:
Compounds, metal, element
Activity:
When silver nitrate is added to the complex
compounds, we see that a precipitate of AgCl is formed. The weight of
precipitate for different complex compounds, is different, implying that each
time different number of Cl- ions react.
Real Life Question:
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Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Coordination compounds | They are complex compounds in which the metal atoms are bound to a number of anions or neutral molecules. |
| Primary valence | It is a linkage b/w the metal ion and the anions in the compound. |
| Secondary valence | It is a linkage b/w the metal ion and the molecules/ions directly attached to it. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Series of complex compounds of cobalt(III) chloride with ammonia | Add silver nitrate solution to each compound. |
| Solution of silver nitrate | Add equal amounts of silver nitrate to the complex compounds. |
Real life uses :
Coordination compounds are used in electroplating, textile dyeing.
Places to visit :
Laboratory
Practical examples around us
| Examples | Explainations |
|---|---|
| Chlorophyll | It is a coordination compound of magnesium. |
What you learn in Theory:
The formation of a coordination compound.
What you learn in Practice:
How different structures of coordination compounds affect their
properties.