How much does the alkalinity of a water sample change upon addition of 10 mol/L of the following chemicals? Assume alkalinity is determined by titration to pH 4.7 and that the water is initially at pH 7.5 due to the presence of an unknown mixture of weak acids and bases. Briefly explain your reasoning. HCI (ii) NaOH (iii) NaCO, (iv) NaHCO3 (v) CO (vi) NaHCit (vii) FeCl3 How would your answers to part (a) be different if the solutions were initially at pH 8.5? You need not do any calculations; just explain the reasoning that leads you to conclude whether the change in the alkalinity would larger, smaller, or the same.