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 524018 Pocket-CASSY 2 Bluetooth LD
1 524019 * Rechargeable battery for Pocket-CASSY 2 Bluetooth LD
1 5240031 * Bluetooth dongle LD
1 524220 CASSY Lab 2 LD
1 5240672 pH adapter S LD
1 6674172 pH sensor with plastic shaft, BNC LD
1 607105 Magnetic stirrer mini LD
1 666851 Stirring magnet 25 mm x 6 mm Ø, circular LD
1 665845 Burette, clear glass, 25 ml LD
1 666559 Burette clamp for 1 burette, roller clamp LD
1 665816 Burette filling funnel plastic, 35 mm Ø LD
1 30002 Stand base, V-shaped, small LD
1 30043 Stand rod, 75 cm, 12 mm diam. LD
1 30126 Stand rod 25 cm, 10 mm Ø LD
1 30011 Saddle base LD
1 30109 Bosshead S LD
1 666555 Universal clamp 0...80 mm LD
1 665997 Graduated pipette 10 ml LD
1 666003 Pipetting ball (Peleus ball) LD
1 664130 Beaker, Boro 3.3, 250 ml, squat LD
1 661243 Wash bottle PE 500 ml LD
1 661082 Stopcock grease, 60 g LD
1 6719560 Acetic acid, 0.1 mol/l, 500ml LD
1 6738410 Dangerous good Sodium hydroxide solution, 0.1 mol/l, 500ml LD
GHS05 Danger H290
1 6742500 Dangerous good Phenolphthaleine solution, 100 ml LD
GHS02GHS08 Danger H225 H350 H341
1 6744640 Buffer solution pH 4.00, 250 ml LD
1 6744670 Buffer solution pH 7.00, 250 ml LD
1 6753400 Water, pure, 1 l LD
1 additionally required: PC with Windows 7 or higher

Articles marked with * are not essential, we do however recommend them to carry out the experiment.

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Experiment Instructions

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