Download - Titration
Titration – process of determining the volume of a standard solution that will be required to react completely with a a mesured amount of a sample
containing the substance under analysis.
A measured volume of the vinegar is placed in a flask.
5.0 mLA few drops of phenolpthalein areadded
After an initial buret reading, standard solution of 0.1N NaOH is added slowly
Near the end of the titration the indicator momentarily changes to pink but goes back to colorless with swirling
When the end point is reached (equivalence point), a tiny excess of OH- is present, shown by the permanent change of color to pink.
The difference between the final buret reading and the initial buret reading gives the volume of the standard NaOH used
35.2 mL
At the equivalence point
Amount of solute (standard solution) = amount of solute (unknown sample)
Number of meq (std soln) = number of meq (unknown sample)
N V (Std. soln) = N V (unknown sample)
Determination of the N of CH3COOH in vinegar
N V CH3COOH = N VNaOH
Titration Process
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