Carboxylic acid esters are saponified in an alkaline medium according to the second order reaction rate (law). In the process, hydroxide ions with a high ion mobility are consumed in reaction with an ester. The temporal course of reaction can thus be advantageously monitored by using the measurements of the changing conductance.
Determine the reaction rate constant for the saponification of ethyl butyrate in an ethanol-water mixture at 50°C via the conductance measurements.
| Materiallist (Excerpt) |
Product |
Amount |
|
Cobra3 BASIC-UNIT, USB
|
12150-50
|
1
|
|
Magnetic stirrer MR Hei-Standard
|
35750-93
|
1
|
|
Electronic temperature controller EKT Hei-Con
|
35750-01
|
1
|
|
Measuring module Conductivity
|
12108-00
|
1
|
|
Conductivity probe K1
|
18151-02
|
1
|
|
Measuring module, Temperature NiCr-Ni, 330°C
|
12104-00
|
1
|
|
Condenser, Dimroth type GL25/12
|
35815-15
|
1
|
|
Thermocouple NiCr-Ni, sheathed
|
13615-01
|
1
|
|
Round flask,100ml,3-n.,GL25/2GL18
|
35677-15
|
1
|
|
Ethyl alcohol, absolute 500 ml
|
30008-50
|
1
|
|
Power supply 12V / 2A
|
12151-99
|
1
|
|
Software Cobra3 Conductivity
|
14508-61
|
1
|
|
Caustic soda sol.,0.1M 1000 ml
|
48328-70
|
1
|
|
Water, distilled 5 l
|
31246-81
|
1
|
|
Ethyl butyrate 100 ml
|
48012-10
|
1
|
|
Stand.solu.1413æS/cm(25øC), 460ml
|
47070-02
|
1
|
|
Pipettor
|
36592-00
|
1
|
|
Universal clamp
|
37715-00
|
2
|
|
Crystallizing dish, boro3.3, 1000ml
|
46245-00
|
1
|
|
Pasteur pipettes, 250 pcs
|
36590-00
|
1
|
|
Spring balance holder
|
03065-20
|
1
|
|
Magn.stirring bar 25mm, ov.
|
46300-01
|
1
|
|
Support rod with hole, stainless steel, 10 cm
|
02036-01
|
1
|
|
Right angle clamp
|
37697-00
|
3
|
|
Rubber caps, pack of 20
|
02615-03
|
1
|
|
Volumetric pipette, 25 ml
|
36580-00
|
2
|
|
Rubber caps, 10 pcs
|
39275-03
|
1
|
|
Glass tube, straight, l=80 mm, 10/pkg.
|
36701-65
|
1
|
|
Cannula 0.6x60 mm, Luer, 20 pcs
|
02599-04
|
1
|
|
Hose clamp for 5-12 mm diameter
|
40997-00
|
4
|
|
Syringe 1ml, Luer, 10 pcs
|
02593-03
|
1
|
|
Magnetic stirring bar 30 mm, cylindrical
|
46299-02
|
1
|
|
Wash bottle, plastic, 500 ml
|
33931-00
|
1
|
|
Rubber tubing, i.d. 6 mm
|
39282-00
|
3
|
|
Laboratory Experiments Physics, Chemistry, Biology andApplied Sciences, CD-ROM, incl. operating manuals
|
16502-42
|
1
|
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