What are the properties of an ionic compound?
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What are the properties of an ionic compound?
Aug 26, 2022, 16:45 IST
Properties of Ionic compounds:
The important properties of ionic compounds are ____
i. These compounds usually exists in the solid state.
ii. The crystalline ionic compounds have well defined crystal structure or crystal lattice.
iii. Ionic compounds have high melting points and boiling points due to powerful electrostatic force between ions.
e.g., m.pt of NaCl is 803 0 C.
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iv. They are generally soluble in polar solvents, having high value of dielectric constant but insoluble in non-polar solvents due to low dielectric constant. The solubility of ionic compounds decreases with increase in covalent character of ionic compounds. The solubility of these compound is governed by ___
a) Lattice energy: Larger the lattice energy, the lesser is the solubility.
e.g., sulphates and phosphates of Ba & Sr are insoluble in water due to high lattice energy.
b) Heat of hydration: Larger the heat of hydration, the more is the solubility of ionic compound.
e.g., AlCl 3 , though covalent in nature is soluble in water due to high value of heat of hydration.
v. In solid state they do not conduct electricity since there is no free movement of electrons but in molten state and in solution they are good conductor of electricity due to presence of charged ions in them.
vi. Ionic compounds undergo ionic reactions which have very high reaction rates. i.e., quite fast e.g., NaCl - (aq) + Ag + NO 3 (aq) ® AgCl(s) ¯ + NaNO 3(g) white ppt.
vii. They do not exhibit isomerism due to non-directional nature of the polar bonds present in these compounds.
What are the properties of an ionic compound? pdf
