Question

Consider a titration of formic acid (HCOOH, K_a = 1.8 x 10^-4) with NaOH. The experiment is halted when half of the acid has been titrated. Which statement correctly describes the composition of the titration solution? Check all that apply.

Group of answer choices

The concentration of HCOOH is greater than the concentration of H+.

The concentration of HCOO− is approximately equal to the concentration of HCOOH.

The concentration of formate ions (HCOO−) is smaller than the concentration of H+.

The concentrations of HCOOH and H+ are equal.

Answer 1

the addition of NaOH will increase the extent of dissociation of HCOOH as it will tend to keep the K_a value constant.

HCOOH a by its formic acid is a weak acid dissociation constant value Ka , as indicated 1.88L04. It dissociates as. A нсоон + H, O which is equivalent HCOOH to 3 Hycoon 4 но" a ² H+ + HCOO Ka = [H #] [Hoo [Hoou] to Now, NaOH is a strong base, HCOOH & Na+ + OH – H₂O + HCOO + Na & forms undissociated molecules of water. So, if the experiment is halted when half of the acid is titrated at that point, ") concentration of HCOOH is approximately equal to the concentration of Hool & y Concentration of undissociated Hoooh is greater than HA (as Ka La & it is a weak acid)