Acetic Acid
Calculation Method: Acid Dissociation Constant (Ka); pH: 4.76; [A-]/[HA] (Acid/Base Ratio): 1; Ka Value: 0.0000175
pKa: 4.756961951
pKa Calculator
Chemistry0.0(0)
Calculates the pKa value of a solution using either the Henderson-Hasselbalch equation or the acid dissociation constant (Ka).
More tools:Science & Lab Calculators
How To Use
How to use this calculator
Start with your values, or try a preset.
Step 1
Enter Calculation Method, pH, [A-]/[HA] (Acid/Base Ratio), and Ka Value in the units shown.
Step 2
Read pKa in the results panel. Results update as you change the inputs.
Step 3
Choose a preset to load an example, then adjust the values for your situation.
Worked Examples
Example calculations
See the inputs and their calculated results.
Ammonia
Calculation Method: Acid Dissociation Constant (Ka); pH: 9.25; [A-]/[HA] (Acid/Base Ratio): 1; Ka Value: 0.000000000562
pKa: 9.250263684
Formic Acid
Calculation Method: Acid Dissociation Constant (Ka); pH: 3.75; [A-]/[HA] (Acid/Base Ratio): 1; Ka Value: 0.000178
pKa: 3.749579998
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