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When Is Equivalence Point Reached?

Robert Thorne • • 7 min read
When Is Equivalence Point Reached?

Key Takeaways: Equivalence Point
The equivalence point or stoichiometric point is the point in a chemical reaction when there is exactly enough acid and base to neutralize the solution. In a titration, it is where the moles of titrant equal the moles of solution of unknown concentration.

How do you know when an equivalence point is reached?

On the right is a titration in which the acid is added to the base. In this case, the pH starts out high and decreases during the titration. In both cases, the equivalence point is reached when the moles of acid and base are equal and the pH is 7. This also corresponds to the color change of the indicator.

Is equivalence point always 7?

At the equivalence point, all of the weak acid is neutralized and converted to its conjugate base (the number of moles of H+ = added number of moles of OH–). However, the pH at the equivalence point does not equal 7. This is due to the production of conjugate base during the titration.

Robert Thorne
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Robert Thorne

Robert Thorne covers electric vehicle innovations, autonomous driving systems, global mobility trends, and automotive engineering developments.