Chemistry
Titration Calculator
Find the unknown concentration from a titration using the balanced reaction coefficients.
Your inputs
Change any value to update the result instantly.
Concentration of the unknown
0.125 mol/L
Moles of titrant delivered
0.0025 mol
Moles of the unknown reacted
0.0025 mol
Stoichiometry used
1 mol titrant reacts with 1 mol of the unknown
Mass concentration if M_r = 100 g/mol
12.5 g/L
This is the equivalence-point relation. The indicator end point is a close approximation of it, and the pH at equivalence is only 7 for a strong acid with a strong base.
What this calculator does
Determines the concentration of an unknown solution from titration volumes and the balanced reaction coefficients.
What your result means
The molarity of the analyte implied by the titrant delivered at the equivalence point.
Formula and working
a × M_a × V_a = b × M_b × V_b
- 1
Collect the inputs
Concentration of the titrant (M_a) = 0.1 mol/L; Volume of titrant used (V_a) = 25 mL; Volume of the unknown (V_b) = 20 mL; Coefficient of the titrant (a) = 1; Coefficient of the unknown (b) = 1
- 2
Apply the formula
a × M_a × V_a = b × M_b × V_b
- 3
Result
Concentration of the unknown = 0.125 mol/L
Frequently asked questions
Symbols and assumptions
- M_a, V_a
- Titrant concentration and volume
- M_b, V_b
- Analyte concentration and volume
- a, b
- Stoichiometric coefficients from the balanced equation
- • The reaction is complete and follows the stated stoichiometry.
- • The end point coincides closely with the equivalence point.
Sources and review
Reviewed 2026-09-22 · Next review 2027-09-22
- • Indicator choice shifts the observed end point. pH before or after equivalence requires full equilibrium calculations.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
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