pH Dilution Calculator
Calculate the new pH after diluting an acid or base solution.
Enter initial pH, volume, and dilution volume.
Diluted pH
pH dilution changes the hydrogen ion concentration, which shifts the pH toward 7 (neutral).
For acids (pH < 7):
[H⁺] initial = 10^(−pH)
[H⁺] final = [H⁺] initial × (V_initial / V_total)
pH final = −log₁₀([H⁺] final)
For bases (pH > 7):
[OH⁻] initial = 10^(pH − 14)
[OH⁻] final = [OH⁻] initial × (V_initial / V_total)
pOH final = −log₁₀([OH⁻] final)
pH final = 14 − pOH final
Key points:
- Each 10× dilution shifts the pH approximately 1 unit toward neutral (7)
- You can never dilute past pH 7 with pure water
- This calculation assumes ideal dilution with pure water