The K_(a) value of formic acid and acetic acid are respectively, 1.77 xx 10^(-4) " and 1.75 xx 10^(-5). The ratio of the acid strength of 0.1 N acids is

The K_(a) value of formic acid and acetic acid are respectively, 1.77

1.	The K_(a) value of formic acid and acetic acid are respectively, 1.77 xx 10^(-4) " and 1.75 xx 10^(-5). The ratio of the acid strength of 0.1 N acids is
Answer» 10 3.178 0.3 0.1 Solution :`HA hArr H^(+) + A^(-), K_(a) = ([H^(+)][A^(-)])/([HA])` LET `C MOL L^(-1)` be the conc. and `alpha` its DEGREE of dissociation `:. K_(a) = (C alpha xx C alpha)/(C (1 - alpha)) = C alpha^(2)` (where `alpha` is very small) `:. alpha = sqrt((K_(a))/(C))` where C is constant, `[H^(+)] prop alpha` `:. (alpha_(1))/(alpha_(2)) = sqrt((K_(a_(1)))/(K_(a_(2)))) = sqrt((1.77 xx 10^(-4))/(1.75 xx 10^(-5)))` `= sqrt(10) = 3.178`