Question 18

The following reactions occur at 298 K. Arrange them in order of increasing tendency to proceed to completion (least completion → greatest completion).

1) H4C3O4 + H2O ↔ H3O+ + H3C3O4- Kc = 1.4 x 10-3

2) H4C2O2 + H2O ↔ H3O+ + H3C2O2- Kc = 1.8 x 10-5

3) H4C3O3 + H2O ↔ H3O+ + H3C3O3- Kc = 4.1 x 10-3

4) H8C3O3 + H2O ↔ H3O+ + H7C3O3- Kc = 7.1 x 10-15

3 < 1 < 2 < 4

4 < 2 < 1 < 3

4 < 3 < 2 < 1

4 < 2 < 3 < 1

3 < 2 < 4 < 1