The pH of HCOOK cannot be determined without knowing the concentration of the solution. HCOOK is a weak acid, which means that it partially dissociates in water to form H+ and COOK- ions. The pH of a solution of HCOOK depends on the concentration of these ions, which in turn depends on the concentration of the HCOOK solution.

The pH of a solution is defined as the negative logarithm of the hydrogen ion concentration ([H+]). For a weak acid, the hydrogen ion concentration can be calculated using the following equation:

[H+] = Ka * [HCOOK] / [COOK-]

where Ka is the acid dissociation constant. The acid dissociation constant is a measure of the strength of an acid, and it is different for each acid.

For HCOOK, the acid dissociation constant is 1.8 x 10-4. This means that at a concentration of 1 M, HCOOK will dissociate into H+ and COOK- ions to the extent of 1.8 x 10-4 M.

The pH of a 1 M solution of HCOOK can be calculated using the following equation:

pH = -log[H+] = -log(1.8 x 10-4) = 3.74

Therefore, the pH of a 1 M solution of HCOOK is 3.74.