Equivalence point
A good indicator changes color close to the true equivalence point, but a small endpoint error can remain. This topic is part of Chemistry within Science & Nature. This page currently draws on 4 supporting questions, with answers and bonus facts available below.
Equivalence point trivia questions
In a titration, the equivalence point occurs when what has happened?
Answer: Reactants have been added in the stoichiometric ratio
Bonus fact: At equivalence, the amount of titrant corresponds chemically to the amount of analyte according to the reaction equation.
In a strong acid-strong base titration at room temperature, the equivalence point is usually near what pH?
Answer: 7
Bonus fact: The neutral salt and water formed in an ideal strong acid-strong base titration give a nearly neutral equivalence solution.
Is the equivalence point always exactly the same as the indicator endpoint?
Answer: No
Bonus fact: A good indicator changes color close to the true equivalence point, but a small endpoint error can remain.
What is the ideal relationship between a titration endpoint and the equivalence point?
Answer: They should be as close as possible
Bonus fact: Choosing an appropriate indicator reduces the difference between the observed endpoint and true stoichiometric equivalence.