To calculate the pH of a 0.1 M solution of HCl, we can use the formula:pH = -log10[H+]Since HCl is a strong acid, it dissociates completely in water, meaning that the concentration of H+ ions in the solution is equal to the concentration of HCl. 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 HCl is 1.