the ratio of dissociation constant of two weak acids HA and HB is 4.At

1.	the ratio of dissociation constant of two weak acids HA and HB is 4.At what concentration ratio the wo acids will have the same Ph?
Answer» Answer : The concentration RATIO the TWO acids will have the same pH will be in 4:1. Explanation: 1) $HA\rightleftharpoons A^-+H^+$ DISSOCIATION constant of two weak acids HA $K_a=K'_a4$ ...(1) $pH_{HA}=-\frac{1}{2}\log{k_a}+\frac{1}{2}\log{C}$ ..(2) 2) $HA\rightleftharpoons B^-+H^+$ Dissociation constant of two weak acids HB $pH_{HB}=-\frac{1}{2}\log{k'_a}+\frac{1}{2}\log{C'}$ ..(3) Both acids have the same pH, which MEANS that: $pH_{HA}=pH_{HB}$ We get $\frac{C}{C'}=\frac{4}{1}$