12. Calculate the pH of a 0.0020M HCl solution What is the pOH of this solution? (show work) 13. Calculate the hydronium ion concentration, [H3O'), of a solution with a pH of 3.5 What is the hydroxide ion concentration, [OH-]. of this same solution? (show work) 14. Given that the hydroxide ion, OH"), in a solution is 0.00013M, calculate the pH of the solution. pH Is this solution acidic or basic? (show work)