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12.12 Properties of Salts

1) Hydrolysis

This is a reaction in which a salt reacts with water to form a solution which is either acidic or basic in nature.

a) Salt of weak alkali and strong acid

NH4Cl + H2O NH4OH + HCl

(Slightly acidic)

b) Salt of strong alkali and weak acid

K2CO3 + H2O 2KOH + H2CO3

(Slightly basic)

c) Strong alkali and strong acid

NaCl + H2O Not hydrolyse

(neutral)


2) Efflorescence

The property of hydrated crystals to loose water of crystallization is called efflorescence.

e.g. Washing soda ( Na2CO3 . 10 H2O )

Glauberís salt ( Na2SO4 . 10 H2O )

Epson salt ( MgSO4 . 7 H2O )

3) Deliquescence

Certain salts when exposed to atmosphere, absorb moisture, becomes moist and ultimately dissolve in absorbed water forming a saturated solution.

e.g. CaCl2.6H2O, FeCl3, NaOH

4) Hygroscopy

When a salt exposed to atmosphere, absorbs moisture without dissolving in it, this property is called Hygroscopy.

e.g. Anhydrous CaCl2, Silica gel, CaO

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Index

12.1 - Lowry and Bronsted Concept
12.2 - Conjugate Acid Base Pairs
12.3 - Amphoteric Substance
12.4 - Lewis Acids and Bases
12.5 - Strong and Weak Acids and Bases
12.6 - Dissociation
12.7 - Ostwald's Dilution Law
12.8 - Hydrogen Ion Concentration : pH
12.9 - Polyprotic Acids
12.10 - Salts
12.11 - Methods of Preparation of Salts
12.12 - Properties of Salts

Chapter 13

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