Enter your target pH, total buffer concentration, final volume, and preparation method into the Acetate Buffer Calculator to find exactly how much sodium acetate and acetic acid you need — plus the resulting acetate ion concentration, acetic acid concentration, and calculated buffer pH.
Calculated Buffer pH
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Acetate Ion Concentration
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Acetic Acid Concentration
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Sodium Acetate Required
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Acetic Acid Required
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Acetate to Acid Ratio
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Acetate buffers work effectively in the pH range of 3.6 to 5.6, which is approximately one pH unit on either side of acetic acid's pKa value (4.76). Outside this range, the buffer capacity decreases significantly.
The Henderson-Hasselbalch equation pH = pKa + log([A⁻]/[HA]) relates the buffer pH to the ratio of acetate ions to acetic acid. This calculator uses this equation to determine the required concentrations of each component.
Acetate buffers are widely used for nucleic acid purification and precipitation, protein crystallization, gel electrophoresis staining, and hematology applications due to their stability and biocompatibility.
Buffer concentration determines the buffer capacity - its ability to resist pH changes when acids or bases are added. Higher concentrations provide greater buffering capacity but may interfere with some biological processes.
Dissolve the calculated amounts of sodium acetate and acetic acid in about 80% of your final volume of distilled water, adjust pH if needed using HCl or NaOH, then dilute to the final volume.
Temperature, ionic strength, and the purity of chemicals can affect buffer pH. The pKa of acetic acid changes with temperature, so buffers prepared at room temperature may have slightly different pH at other temperatures.
Acetate buffers can be stored at room temperature for several weeks to months if kept sterile. They are relatively stable and inexpensive, making them practical for routine laboratory use.
Anhydrous sodium acetate (MW 82.03) and trihydrate sodium acetate (MW 136.08) will require different masses for the same molarity. Always check which form you're using and adjust molecular weight accordingly.