Chemistry I Objectives Chapter 19

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Chemistry I Objectives Chapter 19 I. Identify the ion concentrations in pure water Kw= 1X10-14 = [H3O+] [OH-] = (1x10-7) (1x10-7) II. Describe the pH and pOH scales and be able to calculate [H+] and [OH-] from pH or pOH. Be able to calculate pH and pOH from [H+] or [OH-] pH=-log[H3O+] pOH=-log[OH-] [H3O+]=antilog - pH [OH-]=antilog –pOH [H3O+] [OH-]=1X10-14 pH +pOH=14 III. How is pH measured? IV. What is a buffer and how do buffers work? V. Describe an acid base titration and how an appropriate indicator is selected. VI. Calculate the concentration of an unknown acid or base from its volume and the volume of acid or base with known concentration required to complete neutralization in a titration reaction. NA ·VA=NB ·VB VII. Explain how indicators work. Hin ↔In- + H+