C4.1.3.1 Reaction of Malachite Green with Hydroxide Ions
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Reaction of Malachite Green with Hydroxide Ions
Reactions in which a participant in the reaction changes color are a suitable choice if one wishes to observe the course of a reaction. Such reactions are easy to track photometrically, because the decrease and increase in the extinction rate can be directly converted mathematically into concentration changes.
In experiment C4.1.3.1, the reaction of malachite green with hydroxide ions is monitored with an immersion photometer in a glass beaker. Blue-green at first, the solution loses color when sodium hydroxide is added. This simple system makes it possible to investigate how the rate of reaction is affected by temperature, concentration and the choice of solvent.
Components:
| 1 | 524 069 | Immersion photometer S |
| 1 | 524 018 | Pocket-CASSY 2 Bluetooth |
| 1 | 524 220 | CASSY Lab 2 |
| 1 | 524 019 | * Rechargeable battery for Pocket-CASSY 2 Bluetooth |
| 1 | 524 0031 | * Bluetooth dongle |
| 1 | 607 105 | Magnetic stirrer mini |
| 4 | 666 851 | Stirring magnet, 25 mm x 6 mm diam. |
| 4 | 664 103 | Beaker, DURAN, 250 ml, square |
| 1 | 665 756 | Measuring cylinder, 500 ml, with plastic base |
| 1 | 665 755 | Measuring cylinder, 250 ml, with plastic base |
| 1 | 665 753 | Measuring cylinder, 50 ml, with plastic base |
| 1 | ADANBL124E | Analytical balance 120 g; 0,0001g, with USB interface |
| 1 | 604 5651 | Spoon-ended spatula, Nickel, 120 mm, 20 mm |
| 1 | 665 793 | Volumetric flask, Boro 3.3, 100 ml |
| 1 | 665 997 | Graduated pipette, 10 ml |
| 1 | 666 003 | Pipetting ball (Peleus ball) |
| 1 | 602 347 | Laboratory bottle, 500 ml, GL 45 thread |
| 1 | 300 11 | Saddle base |
| 1 | 300 41 | Stand rod, 25 cm, 12 mm Ø |
| 1 | 666 543 | Double, crossed boss head, 0...16 mm |
| 1 | 666 555 | Universal clamp, 0...80 mm |
| 1 | 661 243 | Wash bottle, PE, 500 ml |
| 1 | 673 1670 | Malachite green, 25 g |
| 1 | 671 9720 | Ethanol, denaturated, 1 l |
| 1 | 673 6800 | Sodium hydroxide, pellets, 100 g |
| 1 | 675 3400 | Water, pure, 1 l |
additionally required: PC with Windows 7 or higher
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Articles marked with * are not essential, we do however recommend them to carry out the experiment.
