# Equivalence point question - Chemistry. NOT hw.

**URL:** <https://boards.straightdope.com/t/equivalence-point-question-chemistry-not-hw/771930>\
**Category:** Factual Questions\
**Created:** [November 14, 2016, 3:19am UTC](https://boards.straightdope.com/t/equivalence-point-question-chemistry-not-hw/771930 "2016-11-14T03:19:19Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Cardinal](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/cardinal/32/4000_2.png) [@Cardinal](https://boards.straightdope.com/u/Cardinal)\
**Post date:** [November 14, 2016, 3:19am UTC](https://boards.straightdope.com/t/equivalence-point-question-chemistry-not-hw/771930/1 "2016-11-14T03:19:19Z")

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I’m teaching AP Chem for the first time, and I have a question from our textbook-on-a-flashdrive. See picture: [http://i.imgur.com/xr56IeI.jpg](http://i.imgur.com/xr56IeI.jpg)

How can it be titrated halfway to the equivalence point, and have the molarities be equal? I’ve found this “book” being wrong before. But I suspect there’s something I’m missing.

Thanks.

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**Author:** ![Cardinal](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/cardinal/32/4000_2.png) [@Cardinal](https://boards.straightdope.com/u/Cardinal)\
**Post date:** [November 14, 2016, 3:24am UTC](https://boards.straightdope.com/t/equivalence-point-question-chemistry-not-hw/771930/2 "2016-11-14T03:24:55Z")

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Got it, sorry. I’d delete the thread if I knew how.

Half the acid has been converted to the conjugate base, and so their molarities are equal.