Module 7 Overview & Instructions

 

PRT 1220Buffer Solutions

Foreword

Midterm Exam 2 this week!  Although that's our focus, we'll also learn this week about buffer solutions.  No single idea about buffers is particularly difficult, but there are a lot of little details that will trip you up if you skimp on practice.  Just one assignment this week, and it's due on July 2, so if you're planning on a four-day weekend for July 4, get it done before then.

Questions and Answers

Whatever you're struggling with this week, somebody else in our section probably is struggling with it, too.  Post your question on the Module 7 Q&A Board.

If you know the answer to someone's question, post it.  It's almost a certainty that more people in our section than just the person who posted the question want to know the answer.

Learning Outcomes/Objectives

By the conclusion of this learning module, you should be able to:

  • calculate the pH of a polyprotic-acid solution by considering successive dissociations/ionizations.
  • calculate the pH of mixtures of strong acid/weak base and strong base/weak acid, especially through a limiting-reactant approach.
  • understand and use the Henderson-Hasselbalch equation for buffer calculations.
  • calculate the pH of a solution containing large amounts of a weak acid and its conjugate base.
  • write reactions for the reaction of buffer components with strong acid and strong base.
  • calculate the pH of a buffer solution after the addition of strong acid or strong base.
  • determine the capacity of a solution to absorb strong acid or strong base without large pH changes.

 

Stuff to Read, Watch, Think About, and Study

Before you watch the videos below, download the  Download Module 7 Slides

, and use them to take notes as you follow along.

 

read:  Polyprotic Acids Links to an external site.

watch:  Polyprotic Acids; due by July 2 at 23:59 MDT

 

read:  Buffers Links to an external site.

watch:  Strong Acid/Strong Base Equilibria; due by July 2 at 23:59 MDT

watch:  The Henderson-Hasselbalch Equation; due by July 2 at 23:59 MDT

watch:  Buffer Capacity; due by July 2 at 23:59 MDT

watch:  Making Buffer Solutions; due by July 2 at 23:59 MDT

practice:  zero-stakes practice --  Download buffers study problems

;  Download buffers study problems key

do:  WebAssign HW -- Buffers; due by July 2 at 23:59 MDT