Physical and Chemical Properties of Water

Physical properties of water:

– Pure water is transparent, colorless, odourless and tasteless.
– Pure water is a bad conductor of electricity. On addition of impurities, acids, alkalis water can be electrolyzed.
– It has very high dielectric constant and can dissolve most of the ionic compounds.
– It has higher density than ice.
– It is a polar molecule means it has permanent dipole moment.
– It has very high specific heat capacity, latent heat of fusion, latent heat of vaporization etc.

Chemical properties of water:

1. It is neutral in nature. It does not show any reaction with indicators.

2. It is a weak electrolyte due to weak ionization.

3. It reacts with metals to liberate hydrogen.
$$\ce{Zn + H2O->[\text{Steam}]ZnO + H2 ^ }$$
$$\ce{Mg + H2O->[\text{Steam}]MgO + H2 ^ }$$
$$\ce{2Al + 3H2O->[\text{Steam}]Al2O3 + 3H2 ^ }$$

4. It reacts with halogens to give oxygen gas.
$$\ce{2H2O + 2F2->4HF + O2 ^ }$$
$$\ce{2H2O + 2Cl2->4HCl + O2 ^ }$$

5. It reacts with red hot coke to give water gas.
$$\ce{C + H2O->$\underset{\text{Water gas}}{\ce{CO2 + H2O}}$}$$

6. Water reacts with acidic oxides to give acids and basic oxides to give bases.
$$\ce{SO2 + H2O->$\underset{\text{Sulphurous acid}}{\ce{H2SO3}}$}$$
$$\ce{CO2 + H2O->$\underset{\text{Carbonic acid}}{\ce{H2CO3}}$}$$
$$\ce{CaO + HCl->CaCl2 + H2O}$$
$$\ce{MgO + 2HCl->MgCl2 + H2O}$$

7. It is associated with many salts as water of crystallization such as blue vitriol (CuSO4.5H2O), Blue vitriol (FeSO4.7H2O) etc.

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One Response to “Physical and Chemical Properties of Water”

  1. Rama Mugweju

    What are use of copper