C401Ch16LN2 - Chapter 16: Applications of Aqueous...

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Chapter 16: Applications of Aqueous Equilibrium Part 2 Acid-Base Titrations When you add an acid and a base together, a neutralization rxn occurs. In the lab, we do neutralization rxns all the time as titrations. In a titration, a known volume of an acid (or base) is added to a flask, and then a known concentration of a base (or acid) is added slowly from a buret (titrated). The titration is followed with a pH meter and/or an acid/base color indicator so that it is known when the neutralization is complete (UV-Vis, or voltage may also be followed). The point at which the acid and base have neutralized each other stoichiomerically is called the equivalence point . If an acid/base color indicator is used, there is a color change (and pH change) when the endpoint is reached, which should be very close to the equivalence point (if you picked the right indicator). The half-equivalence point is when the concentrations of the acid and its conjugate base are equal to each other, and this is where the pH equals the pKa. Titrations are useful for several purposes:
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C401Ch16LN2 - Chapter 16: Applications of Aqueous...

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