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

This product is classified as a dangerous good and is not available for online purchase.

For ordering the dangerous good or other information please contact our customer service center.
This experiment/set up contains dangerous goods.
These are not available for online purchase.
You may order the experiment/set up without the dangerous goods.


For ordering the dangerous good or other information please contact our customer service center.
Email: webshopuk@ld-didactic.de
Telephone:+49 (0) 22 33 / 604 – 319
Go to contact form

˟

Request an offer

Thank you for your inquiry. We will get back to you as soon as possible.

˟

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 524005W2 Mobile-CASSY 2 WiFi LD
1 524220  4  CASSY Lab 2 LD
1 5240672  4  pH adapter S LD
1 6674172  4  pH sensor with plastic shaft, BNC LD
1 607105  8  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  8  Burette clamp for 1 burette, roller clamp LD
1 665816  4  Burette filling funnel plastic, 35 mm Ø LD
1 30002  4  Stand base, V-shaped, small LD
1 30043  8  Stand rod, 75 cm, 12 mm diam. LD
1 30126  4  Stand rod 25 cm, 10 mm Ø LD
1 30011  4  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 6610821 Stopcock grease 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 H290
1 6742500  4  Phenolphthalein solution, 100 ml LD
GHS02GHS08 H225 H350 H341
1 6744640  4  Buffer solution pH 4.00, 250 ml LD
EUH208 EUH210
1 6744670  4  Buffer solution pH 7.00, 250 ml LD
EUH208 EUH210
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
Print page

Contact Us

Technical Service & Support:

Online Service Portal
Do you have any questions or suggestions regarding our devices, products, experiments, equipment sets or about our software? You need spare parts? FORM

Repair Service
You would like to register a repair? FORM

Europe
For European distributors, please visit: European distributors
Worldwide requests
Please contact us per email: sales@ld-didactic.de

 Click here for our contact form and postal address.

Contact Us