CHEM 1040 Lecture Notes - Lecture 26: Titration, Equivalence Point, Ph Meter

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CHEM 1040 Lecture 26 Buffer Titrations
Titrations
A volumetric analysis where a known solution is used to find the concentration of an
unknown solution
Requirements for a titration are:
One solution’s concentration must be known
The titrant must be a strong acid/base
Exact coefficients must be known
Stoichiometric point where moles are equal must be observable
Neutralization Reactions
Acid + Base Salt + H2O
Reaction is complete when the moles of H3O+ = OH-
o The equivalence point as observed by the pH meter or indicator
Indicators
Sensitive to H3O+ of OH-
Usually weak organic acids that have an equilibrium in water
o Because the left (HIN} and right (IN-) side of their equilibria have different colours
Usually, the colour will change when [HIN] = [In-]
Indicator should be chosen so that the end point and equivalence point are the same
o End point: when colour change occurs
o Equivalence point: when H3O+ = OH-
Types of Titrations
1. Strong acid/Strong base
H3O + + OH- 2H2O
K = 1/kw
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Document Summary

Chem 1040 lecture 26 buffer titrations. Titrations: a volumetric analysis where a known solution is used to find the concentration of an unknown solution. Requirements for a titration are: one solution"s concentration must be known, the titrant must be a strong acid/base, exact coefficients must be known, stoichiometric point where moles are equal must be observable. Neutralization reactions: acid + base salt + h2o, reaction is complete when the moles of h3o+ = oh, the equivalence point as observed by the ph meter or indicator. Indicators: sensitive to h3o+ of oh, usually weak organic acids that have an equilibrium in water, because the left (hin} and right (in. ) side of their equilibria have different colours: usually, the colour will change when [hin] = [in-] Indicator should be chosen so that the end point and equivalence point are the same: end point: when colour change occurs, equivalence point: when h3o+ = oh- Types of titrations: strong acid/strong base, h3o.

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