You can put this solution on YOUR website! Nitric Acid is a strong acid, so is completely ionized dissolved in water. , 63.01 grams per mole. pH is based on MOLARITY, so also since hydronium to nitric acid is 1:1 mole ratio,
M, both hydronium and nitric acid
That is assuming the 12.2 grams is a very small change in volume, which might be incorrect, but the difference in pH will be very, very small.