To calculate the pH of a 0.1 M solution of hydrochloric acid HCl , we can use the formula:pH = -log10[H+]Hydrochloric acid is a strong acid, meaning it dissociates completely in water. Therefore, the concentration of H+ ions in the solution is equal to the concentration of the HCl solution. In this case, the concentration of H+ ions is 0.1 M.Now we can plug this value into the formula:pH = -log10 0.1 pH = - -1 pH = 1So, the pH of a 0.1 M solution of hydrochloric acid at 25C is 1. Since the pH meter has a sensitivity of 0.01 pH units, the measured pH value would be 1.00.