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SCH4U – Acid Base Chemistry 493712450 Date: ________________________ Polyprotic Acids Acids that contain ________________________ active proton When polyprotic acids dissociate, they donate ____________________ at a time The second proton dissociation is much ______________ and therefore usually only consider the ___________________________ Generally, we only consider the ______ dissociation when calculating [H3O+] and pH Subsequent dissociations will be ________________ by hydronium _____________ from the first dissociation Example: H3PO4 Ka1 = 7.52x10-3 Ka2 = 6.23x10-8 Ka3 = 2.2 x 10-13 Calculate the pH of 3.5 M H3PO4. Then calculate the [H2PO4-] and [HPO42-]. Page 1 of 2 SCH4U – Acid Base Chemistry 493712450 Example: Adipic acid is a diprotic acid used to manufacture nylon. Its formula can be shortened to H2Ad. The acid dissociation constants for adipic acid are K a1 3.71 10 5 and K a2 3.87 10 6 . What is the pH of a 0.085 mol/L solution of adipic acid? Mixtures of Acids When dealing with a mixture of two acids, it is usually only necessary to consider the _______________________ The dissociation suppresses dissociation of _______________________ Example Calculate the pH of a solution of 1.00 M HCN and 5.00 M HClO2. KHCN = 6.2x10-10 KHClO2 = 1.1x10-2 Homework Page 578 Question 14 Page 579 Questions 1, 4, 17, 20 Page 2 of 2