Formula: Pre-weighed mixture of buffer salts (e.g., Potassium Hydrogen Phthalate) in a capsule. CAS: Mixture EC No.: Mixture M (Molar Mass): Not applicable D (Density): Not applicable mp (Melting Point): Not applicable bp (Boiling Point): Not applicable Optical Rotation: Not applicable

pH (after dissolution in specified volume): 4.00 ± 0.05 at 25°C. Composition: Each capsule contains sufficient salts to make 100 mL (or 250 mL) of buffer. Dissolution: Completely soluble in distilled water. Convenience: Pre-weighed for accuracy and ease. Stability: Stable for 2 years when stored in a dry place.