The active ingredient in aspirin is acetylsalicylic acid. A 2.51 g sample of acetysalicylic acid required 27.36 mL of a 0.5106 M NaOH for complete reaction. Addition of 13.68 mL of 0.5106 M HCl to the flask containing the aspirin and sodium hydroxide produced a mixture with pH=3.48. Find the molar mass of acetylasalicylic acid and Ka value.
The Attempt at a Solution
I'm not really sure what to do but first i found the number of moles of acetysalicylic acid and NaOH (which is OH-) which were both 0.014 moles and they both have an equivalence point of 0 since it goes to complete reaction...then i get kinda lost..i did a neutralization with C9H8O4 which is acetysalicylic acid with OH- and found the Molar mass of C9H8O4- to be 0.014/v M because we don't know the total volume...then i get lost...