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Acid Base Titrations

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Jamie Busby

on 15 April 2014

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Transcript of Acid Base Titrations

Types of Titrations
Strong Acid-Strong Base Titration
The pH of the solution before the addition of any base is determined by the initial concentration of the strong acid.


Between the initial pH and the equivalence point (remaining acid):


The pH of the solution before the equivalence point is determined by the concentration of acid that has not yet been neutralized.
The Equivalence point:
The initial pH (initial acid):
Thus, the initial pH is low.
At the equivalence point, an equal number of moles of the NaOH and HCl have reacted, leaving only a solution of their salt, NaCl.
After the equivalence point (excess base):
The pH of the solution after the equivalence point is determined by the concentration of the excess NaOH in the solution.
Weak Acid-Strong Base
Titration
The initial pH (initial acid):
We use Ka of the acid to calculate this pH with a RICE table.
Between the initial pH and the equivalenc point (buffer mixture):
Prior to reaching the equivalence point, the acid is being neutralized, and its conjugate base is forming.
The Equivalence Point:
At this point all of the moles of sodium hydroxide completely react with all of the moles of acetic acid to form their salt, sodium acetate.
After the equivalence point (excess base):
The pH is determined by the [OH-] from the excess NaOH.
The method for calculating pH in this region is therefore like that for the strong acid-strong base titration.
Titration
The process in which an acid-base neutralization reaction is used to determine the concentration of a solution of unknown concentration.
Neutralization
A reaction in which an acid and a base react in aqueous solution to produce a salt and water.
Vocabulary
Acid Base Titrations
Steps of A titration
Step One
A measured volume of an acidic or basic solution of unknown concentration is placed in a beaker.

An acid-base indicator is also included in the beaker.
Step Two
A buret is filled with the titrating solution of known concentration. This solution is called the standard solution.
Step Three
Measured volumes of the standard solution are added slowly and mixed into the solution in the beaker. The indicator will briefly change color.


This process continues until the reaction between the acid and the base reaches the equivalence point.
Full transcript