Question

6) (Total 20 points) Calculate the pH at each point below if 20.00 ml of 0.100 M pr acid (HA) titrated with 0.100 M sodium hydroxide. (a) 4 points) What is the plH of the solution before any sodium hydroxide is added? (b) (4 points) What is the pll after 10.00 ml of sodium hydroxide solution are adde (c) (8 points) What is the pH at the equivalence point?

Answer 1

H_A rightarrow H^+ A^- [H^+ } = 1.14 times 10^-3 p^H = 2.94 No.of milimals of acid(HA) = 2 millisecond No of milimole of NaoH = 1 milimole P^H = 4.89 At equvalance point no of milimole H_A = no of milimoleof NAoH 0.05 M it is a self of weak acid stiemg base P^H = 8.8 Now p^H id due to only NaoH ie due to 2^ml NaoH = 4.55 times 10^-3 m p^H = 11.66