To calculate the pH of a solution with 0.1 M HNO3, we need to know the concentration of hydrogen ions H+ in the solution. Nitric acid HNO3 is a strong acid, which means it dissociates completely in water to form H+ ions and NO3- ions. For every mole of HNO3, one mole of H+ ions is produced. So, the concentration of H+ ions in the solution is equal to the concentration of HNO3, which is 0.1 M.Now, we can use the pH formula:pH = -log10[H+]Where [H+] is the concentration of hydrogen ions in the solution.pH = -log10 0.1 pH = - -1 = 1The pH of the solution with 0.1 M HNO3 is 1.