What you provide
What you provide
- Weak-acid concentration expressed in mol/L, using the same scenario as the other inputs
- Acid dissociation constant, using the same scenario as the other inputs
CHEMISTRY / ACID-BASE EQUILIBRIUM
Weak Acid pH Calculator
Estimate ideal monoprotic weak-acid pH using the exact concentration-based quadratic solution. Inspect the equation, substituted values, assumptions, and result in one guided chemistry workspace.
- 01 Calculated in this tab
- 02 Values stay in this browser tab
- 03 Use boundary
Use boundary
Calculation path
Estimate ideal monoprotic weak-acid pH using the exact concentration-based quadratic solution. The page evaluates the displayed equation from your supplied values and presents both symbolic and substituted KaTeX working so the arithmetic can be checked.
Calculation path
[H+]=(-Ka+sqrt(Ka^2+4KaC))/2; pH=-log10[H+]
What you receive
What you receive
- Estimated pH from the stated equation
- A symbolic formula plus substituted working with your values
- Visible assumptions, field guidance, and an authoritative learning reference
Use boundary
Choose the maximum decimal places shown. This does not increase source accuracy.
The acid is monoprotic, water autoionization and activities are neglected, and no other acid-base species are present.
Use internally consistent units and retain extra precision when carrying the result into another calculation.
Reviewed reference factors