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.
Learning objectives
- 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.