What is the pH of a solution if two aspirin each containing 500mg of acetylsalicyclic acid were dissolved in 325 ml of water?

Answer 1

If we call aspirin, HA, then the acid dissociates in water as
HA ==> H^+ + A^-

Ka = (H^+)(A^-)/(HA)
(H^+) = x
(A^-) = x
(HA) = moles aspirin/L soln.
moles aspirin = 2*500/molar mass aspirin.
L soln = 0.325 L
Solve for x and convert to pH.
Post your work if you get stuck.

Answer 2

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