Double Salts and Coordination Compounds

In summary, when solutions containing two or more salts in stoichiometric proportions are allowed to evaporate, crystals of new compounds, including double salts and coordination compounds, can form. The solutions can also contain other substances such as acids and bases. The crystals of double salts are made up of constituent salt molecules held together by strong ionic bonds, and these interactions are of a chemical nature. The presence of free NH3 molecules in a coordination complex is due to the equilibrium reaction between ammonia and water.
  • #1
Ashu2912
107
1
This is an excerpt from the book I'm referring:
"...when solutions containing two or more salts in stoichiometric (simple molecular) proportions are allowed to evaporate, crystals of new compounds separate out. These compounds are of two types : (1) Double Salts and (2) Coordination compounds."

Q1. As per the above definition, should the solutions contain "salts only"? Because when we mix NiCl2 soln. and NH3, we get a coordination compound. Here aq. NH3 is not a "salt" by definition...

Q2. Are the constituent particles in the crystals of double salts its constituent salt molecules? If so, what type of interactions hold them together in the lattice? Re these interactions physical or chemical?

Q3. For a coordination complex to be formed, free NH3 molecules must be present. Are they formed due to the eqm. NH3 + H2O -> NH4+ + OH-
 
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  • #2
?Answer 1: No, solutions can contain other substances such as acids and bases, in addition to salts. Answer 2: Yes, the constituent particles in the crystals of double salts are its constituent salt molecules held together by strong ionic bonds. These interactions are chemical in nature. Answer 3: Yes, free NH3 molecules are formed due to the equilibrium reaction between ammonia and water.
 

What are double salts?

Double salts are compounds that contain two different cations and/or anions. These salts are formed when two different salts are mixed together and have a distinct chemical formula.

What are coordination compounds?

Coordination compounds are complex substances composed of a central metal ion or atom surrounded by ligands. Ligands are molecules or ions that have at least one lone pair of electrons that can bond with the central metal ion.

What is the difference between a double salt and a coordination compound?

The main difference between double salts and coordination compounds is the composition of their ions. Double salts contain two different cations and/or anions, while coordination compounds have a central metal ion surrounded by ligands.

How are double salts and coordination compounds named?

Double salts are named by combining the names of the individual salts that make up the compound. Coordination compounds are named by listing the ligands first, followed by the central metal ion and its oxidation state.

What are some common applications of double salts and coordination compounds?

Double salts and coordination compounds have many practical applications in various industries. They are often used as catalysts, dyes, and in the production of medicines and fertilizers. They are also commonly used in analytical chemistry to identify and quantify the presence of certain substances in a mixture.

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