Wash bottle, plastic, 500 ml Rubber tubing, i.d. 6 mm 4 Hose clip, diam. 8-16 mm, 1 pc. Glass rod,boro 3.3,l=200mm, d=5mm 1 Laboratory Experiments Physics, Chemistry, Biology and 1 Cobra3 Chem-Unit

25. Graduated cylinder 100 ml

1 pcs

26. Rubber caps, 10 pcs 1

pcs

27. Glass beaker DURAN®, tall, 250 ml

4 pcs DURAN

28. Volumetric pipette, 20 ml

1 pcs

29. Funnel, glass, top dia. 80 mm 1

pcs

30. Volumetric pipette, 10 ml 1

pcs

31. Volumetric pipette, 5 ml

6 pcs

32. Spoon, special steel 1

pcs double ended, one end spoon and other end spatula,stainless steel polished, length 150mm

33. Wash bottle, plastic, 500 ml

1 pcs

34. Rubber tubing, i.d. 6 mm 4

pcs or interior pressure of little more than 1 bar; soft rubber, red one meter. Wall thickness 1.5 mm.

35. Hose clip, diam. 8-16 mm, 1 pc.

4 pcs

36. Glass rod,boro 3.3,l=200mm, d=5mm 1

pcs

37. Laboratory Experiments Physics, Chemistry, Biology and 1

pcs Applied Sciences, CD-ROM, incl. operating manuals 3 Fractional distillation with the bubble tray column with the Cobra3 Chem-Unit What you can learn about: 1 set - Bubble tray column - Rectification - Continuous and discontinuous - distillation - Gas chromatography Principle and tasks: In countercurrent distillation rectification using a column, the rising va- pour can enter into interactions with the condensate. In this manner, a frac- tional distillation, i.e. a distillation in several steps for the separation of can be performed in a single apparatus. If bubble tray columns are used conden- sate can be removed from the individual bubble trays. The sump product, the head products and the condensates of both trays are examined and compared gas chromatographically. Consist of :

1. Cobra3 Chem-Unit

1 pcs allows to measure all important measuring quantities in chemistry and biology. You can run the Chem Unit with a computer via serial interface or without a computer combined with the Com-Unit. Inputs: -pHPotential 0-14 pH 0.01 pH -2.2-2.2 V +-1mV 10 Giga-Ohm, BNC -Conductivity 6 ranges of measure ment 0-1000 mScm. pHPotential and Conductivity are el ectrically isolated -Temperature NiCr-Ni-Thermoelem. T1,T2,T3 -100 to +1500 degrC -Temperature Pt1000 sensor T4 -100 to +850 degr.C -Temperature sensor in housing T0 0 to 85 degr.C. -Analog In 3 ranges of measur. +-3.2V; 32V; 81V -TTL InOut for drop counter or motor piston burett General technical data: -Voltage output 5V 0.2A e.g. for drop counter -Connections RS232-D-Sub-9 jack -Bit rate up to 115200 bits -Voltage supply 12V 6W -shock-resistant plastic housing with support bases, a wide range of fixing possibilities and two lateral connectors for cascading further units

2. Power supply 12V 2A