Product details

Titration curves and buffering capacity with Cobra4

Titration curves and buffering capacity with Cobra4

Item no.: P3061660

Difficulty Expenditure of Time print
  • Description
  • Scope of Supply
  • Accessories
  • Downloads and Documents

Principle

pH values can be measured with the aid of electrochemical measurements and proton-sensitive electrodes (e.g. glass electrodes). By combining a glass electrode with a reference electrode in one housing, a single-rod glass electrode, which is appropriate for acid-base titrations, is created. The titration curves allow an exact determination of the equivalence point in titrations of strong and weak acids and bases.

Benefits

  • Drop counter optimizes the experimental procedure
  • Simplified implementation: all pre-settings already prepared
  • Extensive automation of the experiment allows concentration on the learning objectives

Tasks

  1. Determine the titration curves of different neutralisation reactions.
  2. Determine the titration curve of an ampholyte (glycine).
  3. Determine the buffering capacity of various aqueous acetic acid/sodium acetate mixtures at different total concentrations.

What you can learn about

  • Strong and weak electrolytes
  • Hydrolysis
  • Dissociation of water
  • Amphoteric electrolytes
  • Isoelectric point
  • Law of mass action
  • Indicators
  • Glass electrode
  • Activity coefficient
  • Buffering capacity
  • Henderson-Hasselbalch equation

Necessary accessories

  • Precision balance 6200g/0.01g

Software provided. Computer not included.

Device Name Item no. Qty
curricuLAB measureLAB 14580-61 1,00
Buffer solution, pH 4.62 1000 30280-70 1,00
Beaker, 100 ml, high-form 46026-00 1,00
USB charger for Cobra4 Mobile-Link 2 and Wireless/USB-Link 07932-99 2,00
Retort stand, h = 750 mm 37694-00 1,00
Volumetric pipette, 25 ml 36580-00 5,00
Burette, lateral stopcock, Schellbach, 25 ml 36506-01 1,00
Sodium acetate, anhydr. 25 31612-25 1,00
Acetic acid, 1 M sol., 1000 48127-70 1,00
Holder for sensors with support rod 12680-00 2,00
Rubber caps, 10 pcs 39275-03 1,00
Pipettor 36592-00 1,00
Volumetric flask 1000ml, IGJ24/29 36552-00 4,00
Funnel, glass, top dia. 80 mm 34459-00 3,00
Buffer solution, pH 9 1000 30289-70 1,00
Beaker, 250 ml, high-form 46027-00 1,00
Cobra4 Wireless/USB-Link incl. USB cable 12601-10 2,00
Right angle boss-head clamp 37697-00 3,00
Volumetric pipette, 50 ml 36581-00 5,00
Spoon, special steel 33398-00 1,00
Caustic soda solution, 1.0 m, 48329-70 1,00
Immersion probe NiCr-Ni, teflon, 300 °C 13615-05 1,00
Weighing dishes, square shape, 84 x 84 x 24 mm, 25 pcs. 45019-25 1,00
Graduated pipette, 1 ml 36595-00 1,00
Volumetric pipette, 1 ml 36575-00 1,00
Magnetic stirrer without heating, 3 ltr., 230 V 35761-99 1,00
Water, distilled 5 l 31246-81 2,00
Cobra4 Sensor-Unit Chemistry 12630-00 1,00
Universal clamp 37715-00 1,00
Pipette dish 36589-00 1,00
Volumetric flask 250 ml, IGJ14/23 36550-00 7,00
Wash bottle, plastic, 500 ml 33931-00 1,00
Hydrochloric acid, 1.0 mol/l, 48454-70 1,00
Ortho-phosphoric acid 85% 250 30190-25 1,00
Beaker, 50 ml, high-form 46025-00 3,00
Graduated pipette 10 ml 36600-00 1,00
Volumetric pipette, 2 ml 36576-00 1,00
Beaker, tall form, 150 ml 36003-00 16,00
Glycocoll /glycine/ 10 31341-10 1,00
Magnetic stirring bar 30 mm, cylindrical 46299-02 1,00
Cobra4 Sensor-Unit Drop Counter 12636-00 1,00
Burette clamp, roller mount., 2 pl. 37720-00 1,00
Pasteur pipettes, 250 pcs 36590-00 1,00
Volumetric flask 500 ml, IGJ19/26 36551-00 1,00
Funnel, glass, top dia. 50 mm 34457-00 2,00
pH-electrode, plastic body, gel, BNC 46265-15 1,00
Document     Filesize
p3061660e.pdf Experiment guide, English 925.77 KB

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