dissociation-equilibrium-with-cobra4

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Dissociation equilibrium with Cobra4

Principle

Carboxylic acids are potential electrolytes which exist in a weakly dissociated condition in aqueous solutions. The location of the dissociation equilibrium is quantitatively described by the Ka or pKa value which can be determined with potentiometric measurements.

Device Name	Item no.	Qty
measureLAB, multi-user license	14580-61	1,00
Monochloroacetic acid 100 g	30060-10	1,00
Magnetic stirring bar 15 mm, cylindrical	46299-01	1,00
Right angle boss-head clamp	37697-00	3,00
Water, distilled 5 l	31246-81	1,00
Holder for sensors with support rod	12680-00	2,00
Beaker, Borosilicate, tall form, 50 ml	46025-00	2,00
Pasteur pipettes, 250 pcs	36590-00	1,00
Wash bottle, plastic, 500 ml	33931-00	1,00
Lactic acid 100	30264-10	1,00
Caustic soda sol.,0.1M 1000	48328-70	1,00
Burette clamp, roller mount., 2 pl.	37720-00	1,00
Volumetric flask, Borosilicate, 100 ml, IGJ12/21	36548-00	6,00
Acetic acid 99...100%, pure 1	31301-70	1,00
Immersion probe NiCr-Ni, teflon, 300 °C	13615-05	1,00
Beaker, Borosilicate, tall form, 250 ml	46027-00	1,00
Pipettor	36592-00	1,00
Magnetic stirrer without heating, 3 ltr., 230 V	35761-99	1,00
Buffer solution, pH 4.62 1000	30280-70	1,00
Cobra4 Sensor-Unit Chemistry	12630-00	1,00
Rubber stopper,d=18/14mm, 1 hole	39254-01	1,00
Volumetric pipette, 5 ml	36577-00	6,00
Propionic acid, 500	31753-50	1,00
N-butyric acid 100	30047-10	1,00
pH-electrode, plastic body, gel, BNC	46265-15	1,00
Retort stand, h = 750 mm	37694-00	1,00
Beaker, DURAN®, tall form, 150 ml	36003-00	1,00
Buffer solution, pH 9 1000	30289-70	1,00
Rubber caps, 10 pcs	39275-03	1,00
Pipette dish	36589-00	1,00
Microspoon, steel	33393-00	1,00
Burette, lateral stopcock, Schellbach, 25 ml	MAU-24022021	1,00

Chemitry Experimental setups