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End of a titration calculation

Posted: Sat Dec 03, 2016 7:37 pm
by Elias Ruben 1O
How exactly do you calculate the pH of a titration at the endpoint? And also, does the word "endpoint" refer to the end of the titration, or to something else?

Re: End of a titration calculation

Posted: Sun Dec 04, 2016 4:05 am
by Chem_Mod
The endpoint and the stoichiometric point are often used as interchangeable expressions for the point when the moles of acid are equal to the moles of base, however the endpoint is actually referring to the point in a titration when the indicator changes is color and is not necessarily when the exact stoichiometric point is reached. Also the stoichiometric point calculation process will vary based on the type of titration that you are doing. A strong acid-strong base titration will have a pH = 7 at the equivalence point. However, for a strong acid-weak base titration the pH will be <7 at the equivalence point, and with weak acid-strong base titrations the pH will be >7. If you need examples how to do each different type I recommend you read pgs 530-537 in the textbook.