Chemistry
Neutralization Calculator
Find the volume of base needed to neutralise an acid, using equivalents on both sides.
Your inputs
Change any value to update the result instantly.
Base needed to neutralise
12.5 mL
Equivalents of acid
0.0025 eq
Equivalents of base at the end point
0.0025 eq
Total volume at neutralisation
37.5 mL
Note on normality
Normality = molarity × n-factor, where the n-factor is the replaceable H⁺ or OH⁻ per formula unit
At the equivalence point the equivalents match. The pH there is only 7 for a strong acid with a strong base; salts of weak acids or bases shift it.
What this calculator does
Finds the volume of base required to neutralise a known volume of acid using equivalents.
What your result means
The volume at which the equivalents of acid and base match, which is the equivalence point of the neutralisation.
Formula and working
N₁V₁ = N₂V₂
- 1
Collect the inputs
Normality of the acid (N₁) = 0.1 N; Volume of the acid (V₁) = 25 mL; Normality of the base (N₂) = 0.2 N
- 2
Apply the formula
N₁V₁ = N₂V₂
- 3
Result
Base needed to neutralise = 12.5 mL
Frequently asked questions
Symbols and assumptions
- N
- Normality in equivalents per litre
- V
- Volume in mL
- n-factor
- Replaceable H+ or OH- per formula unit
- • Normality already includes the n-factor of each reagent.
- • The reaction goes to completion.
Sources and review
Reviewed 2026-09-22 · Next review 2027-09-22
- • The pH at equivalence is 7 only for a strong acid with a strong base; other combinations leave a salt that hydrolyses.
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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