Let's simplify aspirin formula to HA.
HA + H2O ==> H3O^+ + A^-
Ka = (H3O^+)(A^-)/(HA)
M = (2*0.325)/molar mass HA
Set up an ICE chart, substitute into the Ka expression and solve for x. Convert that to pH. I assume you know Ka or you can look it up.
Aspirin equilibrium is : HC9H7O4(aq) + H2O (double arrow)C9H7O4^-(aq) + H3O^+
You have 2 tablets each containing 0.325g of active ingredient that you dissolve in water up to 225ml.
Calculate the pH.
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