Reaction of malachite green with hydroxide ions

VC4.1.3.1
Reaction of malachite green with hydroxide ions
Reaction of malachite green with hydroxide ions Reaction of malachite green with sodium hydroxide solution
Reaction of malachite green with hydroxide ions

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Description

Reactions in which a participant in the reaction changes colour 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 colour 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 of equipment sets

1 524069  8  Immersion photometer S LD
1 524018  8  Pocket-CASSY 2 Bluetooth LD
1 524220  4  CASSY Lab 2 LD
1 524019  8  * Rechargeable battery for Pocket-CASSY 2 Bluetooth LD
1 5240031  8  * Bluetooth dongle LD
1 607105  8  Magnetic stirrer mini LD
4 666851  8  Stirring magnet, 25 mm x 6 mm diam. LD
4 664103  8  Beaker, DURAN, 250 ml, squat LD
1 665756  8  Measuring cylinder, 500 ml, with plastic base LD
1 665755  8  Measuring cylinder, 250 ml, with plastic base LD
1 665753  8  Measuring cylinder, 50 ml, with plastic base LD
1 ADANBL124E Analytical balance 120 g; 0,0001g, with USB interface LD
1 6045651 Spoon-ended spatula, Nickel, 120 mm, 20 mm LD
1 665793  8  Volumetric flask, Boro 3.3, 100 ml LD
1 665997  8  Graduated pipette, 10 ml LD
1 666003  8  Pipetting ball (Peleus ball) LD
1 602347 Laboratory bottle, 500 ml, GL 45 thread LD
1 30011  8  Saddle base LD
1 30041  8  Stand rod, 25 cm, 12 mm Ø LD
1 666543  8  Double, crossed boss head, 0...16 mm LD
1 666555  8  Universal clamp, 0...80 mm LD
1 661243  8  Wash bottle, PE, 500 ml LD
1 6731670  4  Malachite green, 25 g LD
1 6719720  4  Ethanol, denaturated, 1 l LD
1 6736800  4  Sodium hydroxide, pellets, 100 g LD
1 6753400  4  Water, pure, 1 l LD
1 additionally required: PC with Windows 7 or higher

Articles marked with * are not essential, we do however recommend them to carry out the experiment.

Experiment Instructions

PDF (Experiment description) PDF (Experiment description) C4.1.3.1 Reaction of malachite green with hydroxide ions
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