`HCOOH (aq) hArr H^+`(aq) +`HCOO^-`(aq),`K_a=1.7xx10^(-4)`
The ionization of formic acid is represented above.Calculate `[H^+]` of a solution initially containing 0.10 M HCOOH and 0.050 M HCOONA :
A. `8.5xx10^(-5) M`
B. `3.4xx10^(-4) M`
C. `4.1xx10^(-3) M`
D. `1.8xx10^(-2) M`
