Ncert Exercises & Solutions

9.29 What properties of water make it useful as a solvent? What types of compound can it (i) dissolve, and (ii) hydrolyse ?

A high value of dielectric constants (78.39

C^{2}

{Nm}^{2}

) and dipole moment make water a universal solvent.

Water is able to dissolve most ionic and covalent compounds. Ionic compounds dissolve in water because of the ion-dipole interaction, whereas covalent compounds form hydrogen bonding and dissolve in water.

Water can hydrolyze metallic and non-metallic oxides, hydrides, carbides, phosphides, nitrides and various other salts. During hydrolysis, H+ and OH– ions of water interact with the reacting molecule.

Some reactions are:

$C a O + H_{2} O \to C a {(O H)}_{2} N a H + H_{2} O \to N a O H + H_{2}$
$C a C_{2} + H_{2} O \to C_{2} H_{2} + C a {(O H)}_{2}$

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