How to Prepare Carbonate-Bicarbonate Buffer pH 9.6

1. 1Step 1: Add approximately 80 mL of distilled water to a 100 mL volumetric flask or beaker
2. 2Step 2: Add 159.0 mg Na2CO3 and stir until completely dissolved
3. 3Step 3: Add 294.0 mg NaHCO3 and stir until completely dissolved
4. 4Step 4: Adjust final volume to exactly 100 mL with distilled water
5. 5Step 5: Mix thoroughly by inversion or gentle stirring
6. 6Step 6: Verify pH is approximately 9.6 using pH meter or indicator

pH adjustment is typically not needed as the buffer ratio determines the final pH (~9.6). If adjustment is required, use small amounts of additional Na2CO3 to increase pH or NaHCO3 to decrease pH

Filter through 0.22 μm membrane filter. Do not autoclave as this will drive off CO2 and alter buffer composition and pH

Level 1 safety: Standard laboratory PPE (safety glasses, lab coat, gloves). Both components are relatively safe but avoid inhalation of powder. Work in well-ventilated area when handling powders

Store at room temperature in tightly sealed container. Stable for 6 months. Avoid exposure to air for extended periods as CO2 exchange can alter buffer composition

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Carbonate-Bicarbonate Buffer (pH 9.2 to 10.6) Preparation and Recipe | AAT Bioquest