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
- Determine the titration curves of different neutralisation reactions.
- Determine the titration curve of an ampholyte (glycine).
- 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.
Scope of Supply
| Device Name | Item no. | Qty |
|---|
| curricuLAB measureLAB, multi-user license | 14580-61 | 1,00 |
| Buffer solution, pH 4.62 1000 | 30280-70 | 1,00 |
| Beaker, Borosilicate, tall form, 100 ml | 46026-00 | 1,00 |
| Retort stand, h = 750 mm | 37694-00 | 1,00 |
| Volumetric pipette, 25 ml | 36580-00 | 5,00 |
| 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, Borosilicate, tall form, 250 ml | 46027-00 | 1,00 |
| 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, Borosilicate, tall form, 50 ml | 46025-00 | 3,00 |
| Graduated pipette 10 ml | 36600-00 | 1,00 |
| Volumetric pipette, 2 ml | 36576-00 | 1,00 |
| Beaker, DURAN®, 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 |
| 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 |
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