Answer to Question #107238 in General Chemistry for Hannah

Question

In which solution is the percent ionization of formic acid, HCOOH, the lowest?
a. 0.20 M HCOOH
b. 0.20 M HCOOh that Isi also 0.10 M NaOH
c. 0.20 M HCOOH that is also 0.10 M NaCL
d. 0.20 M HCOOH that is also 0.10 M HCL

Answer 1

Only HCOOH solution and solution of HCOOH with NaCl gives equivalent ionization. In HCOOH and NaOH solution there is a acid base reaction so the ionization rate will be higher.

In HCOOH with HCl solution there is a common ion effect of H+ ion. Thats why in the sollution "d" there will be lowest rate of ionization of HCOOH.