`HCNO hArr H^(+)+CNO^(-)`

`pH = 2.34 "means" - log [H^(+)]= 2.34 or log [H^(+)]=2.34 or log [H^(+)]=-2.34 = bar(3).66`

or `[H^(+)] = "Antilog" bar(3).66 = 4.57 xx 10^(-3) M`

`[CNO^(-)]=[H^(+)]=4.57 xx 10^(-3) M`

`K_(a)=((4.57xx10^(-3))(4.57xx10^(-3)))/(0.1)=2.09xx10^(-4)`

`alpha = sqrt(K_(a)//C)=sqrt(2.09xx10^(-4)//0.1)=0.0457`.