The expressions for sulphurous acid, has to be written
Acid ionization constant :
Acids ionize in water. Strong acids ionize completely whereas weak acids ionize to some limited extent.
The degree to which a weak acid ionizes depends on the concentration of the acid and the equilibrium constant for the ionization.
The ionization of a weak acid can be given as follows,
The equilibrium expression for the above reaction is given below.
is acid ionization constant,
is concentration of hydrogen ion
is concentration of acid anion
is concentration of the acid
For diprotic acids, the successive ionization constants are designated as
To write: The expressions for sulphurous acid,