CHM 104 1st Edition Lecture 18 Outline of Last Lecture I Review for Exam 2 Outline of Current Lecture II III IV V Aqueous Ionic Equilibria pH Buffered Solutions Henderson Hasselbach Equation How to make a buffer Current Lecture pH Buffered Solutions A solution capable of maintaining pH value even if strong acid or strong base is added Example Blood pH needs to be maintained at a pH range of 7 3 7 5 For most solutions adding strong acid or strong base will cause the pH to change significantly and very rapidly Buffers resist the change by neutralizing any strong acid or strong base added Ex What is the pH of a solution when 50 0 mL of 0 60 M CH3 3N is MIXED with 100 0 mL 0 75 M CH3 3NHCl buffer system Henderson Hasselbach Equation These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute How to make a buffer 1 Decide what you want the pH to be target pH 2 Choose a weak acid that has a pKa that is 1 from the desired pH 3 Use the H H equation to calculate A HA needed 4 Prepare the solution
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