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Water

Chemistry Formulas

About Water (H2O)

Water is one of the most abundant available substance or compound of hydrogen in nature.About three fourth of the earth surface is covered by water.  Water is known as universal solvent because.For More Chemistry Formulas check out Main page of physics wallah.

i) it can dissolve maximum number of compounds.

ii) It is cheaply available

iii) It has high dielectric constant (82D)

Chemical properties of water

i)  Reaction with metals:  Metals of group IA & IIA decompose water to liberate H2 along with evolution of energy (Exothermic reaction).  Hot metals like Zn, Mg, Fe etc, decompose water to liberate H2.  Pb and Cu decompose water only on heating.  Ag, Au, Hg & Pt metals donot decompose water.

ii) Reaction with Non-metals:  Fluorine decomposes cold water forming ozonized oxygen.  Chlorine decomposes cold water forming HCl & HClO,   However, in presence of sunlight HCl and O2 is formed.  Red hot coke on reaction with steam produce water gas.

iii) Reaction with non metal oxide:  Acidic oxides combine with water to form oxo-acid like carbonic acid, sulphurous acid, sulphuric acid, orthophosphoric acid, nitric acid, perchloric acid etc., 

iv) Reaction with Metal oxides: Basic oxides combine with water to form alkalies.

v) Reaction with hydrides, carbides, nitrides & phosphides:  Water decomposes these compounds with liberation of hydrogen, acetylene, ammonia, phosphine respectively.

vi) Hydrolysis: Salt of strong bases with weak acids, weak bases with strong acids and weak bases with weak acids undergo hydrolysis in water. Some slats like BiCl3, SbCl3 on hydrolysis form oxy compounds.  Halides of non-metals like PCl3, PCl5, SiCl4 etc are decomposed by water.

vii) Water of crystallization:  It forms hydrates like CuSO4. 5H2O, MgSO4. 7H2O, FeSO4.7H2O, BaCl2 . 2H2O etc., on combination with water during crystallization. The water present in the hydrates is called water of crystallization.  These are of 3 – types (i) cationic   (ii)  Anion     (iii)  Lattice.

viii) Water as catalyst:  Perfectly dry gases generally do not react but ammonia & HCl gas combine only in presence of moisture. Read more about water resourse.

Prepartion and Properties of Water Pdf

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