To calculate the pH of a 0.1 M hydrochloric acid HCl solution, we can use the formula:pH = -log10[H+]Since HCl is a strong acid, it will dissociate completely in water, meaning that the concentration of H+ ions will be equal to the concentration of HCl. In this case, the concentration of H+ ions is 0.1 M.pH = -log10 0.1 pH = 1.00Using a calibrated pH meter with a sensitivity of 0.01 pH units, the pH of the 0.1 M hydrochloric acid solution at 25C is approximately 1.00.