Question 5 (a) and (b)

5. a. If H3A is a triprotic acid with kai=1 x 104, kaz=1 x 109, kaz=1 x 10-13, calculate the equilibrium concentrations of [HA2') in a 1.0 M H3A aqueous solution. Select your answer from the following table to get your a. (For example, if your answer is ~10-7, then your a is 2). [HA2) 10-6 ~ 10-7 - 10-8 10-10 Then your a 1 2 3 4 5 10-9 N b. Calculate the pH of a 0.10 M (HNR3)X aqueous solution, if the Kb value for NR3 is 1 x10-5. (NR3 is an organic compound). Select your answer from the following table to get your b. (For example, if your answer is 7-8, then your b is 4). pH 4.5 5-6 6-7 7-8 >8 Then your b= 1 2 3 4 5 Question, what is the sum of your a + b ? A A 9 B 8 7 D 6 E 5