What this calculator does
Acid-base titration (equivalence point) works out unknown acid or base concentration from the titrant volume at the equivalence point. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
The inputs explained
| Field | What to enter |
|---|---|
| Titrant concentration (MB) (mol/L) | A number, measured in mol/L. Starts at 0.1. |
| Titrant volume used (VB) (mL) | A number, measured in mL. Starts at 25. |
| Analyte volume (VA) (mL) | A number, measured in mL. Starts at 20. |
| H+ per analyte molecule (nA) | A number. Starts at 1. |
| OH- per titrant molecule (nB) | A number. Starts at 1. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with titrant concentration (mb)
Every other input is held at the calculator’s starting values while titrant concentration (mb) varies. Select any row to load that scenario into the calculator.
| Titrant concentration (MB) (mol/L) | Analyte concentration (MA) | Moles of titrant delivered | Moles of analyte reacted |
|---|---|---|---|
| 0.05 | 0.0625 mol/L | 0.0013 mol | 0.0013 mol |
| 0.08 | 0.1000 mol/L | 0.0020 mol | 0.0020 mol |
| 0.1 | 0.1250 mol/L | 0.0025 mol | 0.0025 mol |
| 0.15 | 0.1875 mol/L | 0.0038 mol | 0.0038 mol |
| 0.2 | 0.2500 mol/L | 0.0050 mol | 0.0050 mol |
| 0.3 | 0.3750 mol/L | 0.0075 mol | 0.0075 mol |