Tris Buffer Calculations

In this tutorial, Dr. Michael Garoutte explains how to perform buffer calculations, a common task in biochemistry labs. Using the popular Tris buffer as an example, this video demonstrates three different methods to prepare a 500 mL, 50 mM Tris buffer at a pH of 7.5. You will learn how to: 1. Calculate the total moles of buffer required. 2. Use the Henderson-Hasselbalch equation to determine the necessary ratio of conjugate acid to conjugate base. 3. Prepare the buffer by combining the solid acid and base forms (Tris-HCl and Tris base). 4. Prepare the buffer by starting with the base form (Tris base) and adding a strong acid (HCl). 5. Prepare the buffer by starting with the acid form (Tris-HCl) and adding a strong base (NaOH). The video also covers important practical considerations, such as verifying the final pH with a meter. --- Chapters 0:00:00 Introduction to Tris Buffer 0:00:58 The Buffer Calculation Problem 0:01:49 Overview of the Three Preparation Methods 0:02:18 Calculate Total Moles of Buffer 0:03:33 Henderson-Hasselbalch Calculation 0:06:01 Verifying the Acid-Base Ratio 0:07:03 Method 1: Using Tris Base & Tris-HCl Solids 0:09:48 Method 2: Using Tris Base & HCl 12:27 Method 3: Using Tris-HCl & NaOH 14:14 Practical Lab Considerations (Using a pH Meter) 15:12 Conclusion