A buffer solution contains 0.90 mol of hydrocyanic acid (HCN) and 0.77 mol of sodium cyanide (NaCN) in 3.80 L. The K, of hydrocyanic acid (HCN) is k, = 4.9e-10. (a) What is the pH of this buffer? pH = (b) What is the pH of the buffer after the addition of 0.31 mol of NaOH? (assume no volume change) pH = (c) What is the pH of the original buffer after the addition of 0.59 mol of HI? (assume no volume change) pH =

Calculate the pH at the equivalence point in titrating 0.037 M solutions of each of the following with 0.033 M NaOH. (a) hydrochloric acid (HCI) pH = (b) arsenous acid (H3ASO3), kg = 5.1e-10 pH = (c) hypochlorous acid (HCIO), Ka – 3e-08 pH =