pH Adjustment Calculator
Acid or base needed to shift pH.
Reviewed by James Whitfield · How we check our maths
Your values
ⓘ Live results
Results
- Reagent needed
- 0.0001 L
- Moles required
- 0.00006
- Direction
- Add acid
- pH change
- 1
Quick answer
Shifting pH by one unit changes hydrogen ion concentration tenfold.
The formula
Δ[H+] = 10^−target − 10^−current
Worked example
Worked example
Using the values the calculator loads with.
Inputs
- Volume1000 L
- Current pH8.2
- Target pH7.2
- Reagent strength1 mol/L
Result
- Reagent needed0.0001 L
- Moles required0.00006
- DirectionAdd acid
- pH change1
How to use the pH Adjustment Calculator
- 1Enter the solution volume.
- 2Enter current and target pH.
- 3Enter reagent molarity.
Frequently asked questions
Why is my real dose higher?
Buffering capacity resists pH change — always dose gradually and retest.
Is this safe for pools?
Use it as a guide only and follow the product's dosing chart.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error