Titration Calculator
Work out an acid base titration at the equivalence point. Enter any three of the acid molarity, acid volume, base molarity and base volume, set the number of acidic protons and hydroxides, and the calculator solves for the missing value.
How to calculate a titration
- Choose which value you want to solve for: a molarity or a volume.
- Enter the other three values, plus the proton and hydroxide counts.
- Read the missing value, found from acid M times V times protons equals base M times V times hydroxides.
Examples
Find the acid molarity
25 mL acid, 0.1 M base, 30 mL base, both monoprotic
0.12 M acid
Diprotic acid
Same volumes, acid with 2 protons
0.06 M acid
Frequently asked questions
What is the titration formula?
At the equivalence point, acid molarity times acid volume times acidic protons equals base molarity times base volume times hydroxides per base unit.
What does M1V1 equal M2V2 mean?
For a monoprotic acid and monobasic base, moles of acid equal moles of base, so M1 times V1 equals M2 times V2. Proton counts adjust this for stronger acids.
Why does the number of protons matter?
A diprotic acid like sulfuric acid donates two protons per molecule, so it needs twice the base. Set the proton count so the equivalence is balanced.
Do the volumes need the same units?
Yes. Use the same unit for both volumes, such as millilitres or litres. The volumes cancel in the ratio, so the answer does not depend on the unit chosen.
What is the equivalence point?
The equivalence point is where the moles of acid protons exactly match the moles of base hydroxides, so the acid and base have fully neutralised.
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