Option 1: Preparation procedure to make an Acetate buffer in the pH range of 3.6 to 5.6 Preparing Buffer Solutions at a Desired pH Option 2: Preparation procedure to make a Phosphate buffer in the pH range of 2.0 to 3.2 Option 3: Preparation procedure to make a Phosphate buffer in the pH range of 5.6 to 8.0 Option 4: Preparation procedure to make a Citrate buffer in the pH range of 3.0 to 7.0 Option 5: Preparation procedure to make a Glycine buffer in the pH range of 8.6 to 10.6 Option 6: Preparation procedure to make a Tris buffer in the pH range of 7.1 to 8.9