To calculate the pH of a solution with a concentration of 0.005 M hydrochloric acid HCl , we first need to determine the concentration of hydrogen ions H+ in the solution. Since HCl is a strong acid, it will dissociate completely in water, releasing H+ ions and Cl- ions. Therefore, the concentration of H+ ions will be equal to the concentration of HCl, which is 0.005 M.Now we can use the pH formula:pH = -log10[H+]where [H+] is the concentration of hydrogen ions in moles per liter M .pH = -log10 0.005 pH 2.3The pH of the solution with a concentration of 0.005 M hydrochloric acid is approximately 2.3.