How to Calculate Acid-Base Equilibrium
What is Acid-Base Equilibrium?
Calculates the balance between acids and bases in chemical solutions using pH and pOH. This tool helps chemists, students, and lab professionals determine hydrogen ion concentrations, solution acidity, and buffering capacity.
Formula
pH = -log[H+], pOH = -log[OH-], pH + pOH = 14
Step-by-Step Guide
- 1Measure or know the hydrogen ion concentration [H+]
- 2Apply the logarithmic pH formula
- 3Calculate pOH from the relationship pH + pOH = 14
- 4Determine if solution is acidic (pH < 7), basic (pH > 7), or neutral (pH = 7)
Worked Examples
Input
[H+] = 1.0 × 10^-7 mol/L
Result
pH = 7 (neutral)
Pure water at 25°C has pH of 7
Common Mistakes to Avoid
- ✕Forgetting the negative logarithm
- ✕Confusing [H+] with pH value
Ready to calculate? Try the free Acid-Base Equilibrium Calculator
Try it yourself →