Question:
Fe3+ cation gives a Prussian blue precipitate on addition of potassium ferrocyanide solution due to the formation of:
Fe3+ cation gives a Prussian blue precipitate on addition of potassium ferrocyanide solution due to the formation of:
Updated On: Jul 6, 2024
- [Fe(H2O)6]2 [Fe(CN)6]
- Fe2[Fe(CN)6]2
- Fe3[Fe(OH)2 (CN)4]2
- Fe4[Fe(CN)6]3
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The Correct Option is D
Solution and Explanation
The correct answer is (D): Fe+3 + K4[Fe(CN)6]→Fe4[Fe(CN)6]3Prussian blue ppt
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Concepts Used:
Werner’s Theory of Coordination Compounds
In 1893 Werner produced a theory to explain the structures, formation and nature of bonding in the coordination compounds. This theory is known as Werner’s theory of coordination compounds.
Postulates of Werner's Theory:
The important postulates as observed by Alfred Werner throughout his experiments are as follows:
- The complex/ coordination compounds contain a central metal atom.
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- Secondary valencies denote the coordination number. They are non-ionizable and are fixed for every metal atom. The secondary valency is generally satisfied by the neutral molecules or negative ions.
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- Though Werner explained some properties of the coordination compound, he failed to explain the colour of the coordinate compound.
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- He could not answer the question, why does the coordination sphere have a definite geometry.