Answer to Question #212219 in General Chemistry for David

Question

Acetylsalicylic acid, HA is an active ingredient in aspirin, has Ka value of 3.0 x10-5 . In order to determine its chemical reactivity, 0.1 mole acetylsalicylic acid is dissolve in 1L of water.

a) Calculate the concentrations of all species in the acetylsalicylic acid solution [6 marks] b) Determine the pH of solution [1 mark]

c) If 100 mL of acetylsalicylic acid sample is titrated with 100 mL of 0.1 M NaOH, what is the pH of this mixture at equivalence point? [3 Marks]

Answer 1

a)Concentration of I) Acetylsalicylic acid=6.4M, HA=7.1M

b)pH of solution=9.3

c)pH of this mixture=5.3