The pH of a 1 N HCl solution can be calculated using the following formula:

pH = -log[H+]

where [H+] is the concentration of hydrogen ions in moles per liter (M).

For a 1 N HCl solution, the concentration of hydrogen ions is equal to the concentration of HCl, which is 1 N. Therefore, the pH of a 1 N HCl solution is:

pH = -log(1) = 0

So, the pH of a 1 N HCl solution is 0.