Titration Calculator

Your details

Choose the one unknown. Enter the other three quantities below.
Used to calculate the equivalence-point pH and suggest an indicator.
Reactive H⁺ per acid molecule: 1 for HCl, 2 for H₂SO₄, 3 for H₃PO₄.
OH⁻ accepted per base molecule: 1 for NaOH, 2 for Ca(OH)₂.
Molarity of the base solution.
mol/L
Volume of base needed to reach equivalence.
Unknown value
0.1 mol/L

The concentration or volume that satisfies the equivalence condition.

Equivalents neutralised0.0025mol
pH at equivalence point7
Recommended indicatorPhenol red (transition 6.8-8.4) or bromothymol blue (6.0-7.6)
7 pH
Strongly acidic<3Weakly acidic3-6Near neutral6-8Weakly basic8-11Strongly basic11+

The required acid concentration is 0.1 mol/L.

  • At the equivalence point the reactive protons from the acid exactly equal those neutralised by the base, with no excess of either.
  • This titration exchanges about 0.0025 mol of protons (n x M x V on each side).
  • The solution at the equivalence point has a pH of 7, neutral as expected for a strong acid + strong base system.

Next stepChoose an indicator whose colour-change range brackets pH 7 for the most accurate endpoint detection.

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