Determination of acidity (pKa value) by titration

VC1.7.2.1
Determination of acidity (pKa value) by titration
Determination of acidity (pKa value) by titration

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Description

In experiment C1.7.2.1, the acidity (pKa value) of acetic acid is determined. Between an acid HA and its base A- the following equilibrium reaction takes place in an aqueous solution :

According to the law of mass action, the equilibrium position is described by the equilibrium constant Ka:

By analogy to the pH value, the pKa value is given as the negative base 10 logarithm of the numerical value of Ka

The lower the value of pKa, the higher the acidity. The pKa value is numerically equal to the pH value of a solution when the protonated and non-protonated forms are present in equal concentration.

Components of equipment sets

1 524005W  4  Mobile-CASSY 2 WiFi LD
1 524220  4  CASSY Lab 2 LD
1 5240672  8  pH adapter S LD
1 6674172  4  pH sensor with plastic shaft, BNC LD
1 607105  4  Magnetic stirrer mini LD
1 666851  4  Stirring magnet 25 mm x 6 mm Ø, circular LD
1 665845  4  Burette, clear glass, 25 ml LD
1 666559  4  Burette clamp for 1 burette, roller clamp LD
1 665816  4  Burette filling funnel plastic, 35 mm Ø LD
1 30002  8  Stand base, V-shaped, small LD
1 30043  8  Stand rod, 75 cm, 12 mm diam. LD
1 30126  8  Stand rod 25 cm, 10 mm Ø LD
1 30011  8  Saddle base LD
1 30109  4  Bosshead S LD
1 666555  4  Universal clamp 0...80 mm LD
1 665997  4  Graduated pipette 10 ml LD
1 666003  4  Pipetting ball (Peleus ball) LD
1 664130  4  Beaker, Boro 3.3, 250 ml, squat LD
1 661243  4  Wash bottle PE 500 ml LD
1 661082  4  Stopcock grease, 60 g LD
1 6719560  4  Acetic acid, 0.1 mol/l, 500ml LD
1 6738410  4  Sodium hydroxide solution, 0.1 mol/l, 500ml LD
GHS05 Warning H290
1 6742500  4  Phenolphthaleine solution, 100 ml LD
GHS02GHS08 Danger H225 H350 H341
1 6744640  4  Buffer solution pH 4.00, 250 ml LD
1 6744670  4  Buffer solution pH 7.00, 250 ml LD
1 6753400  4  Water, pure, 1 l LD
1 additionally required: PC with Windows 7 or higher with WIFI or USB connection

Experiment Instructions

PDF (Experiment description) PDF (Experiment description) C1.7.2.1 Determination of acidity (pKa value) by titration
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