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Reaction of malachite green with hydroxide ions

Reaction of malachite green with hydroxide ions

VC4.1.3.1

Reaction of malachite green with sodium hydroxide solution

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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 4	Immersion photometer S
1	524005W2	Mobile-CASSY 2 WiFi
1	524220 4	CASSY Lab 2
1	607105 8	Magnetic stirrer mini
4	666851 4	Stirring magnet, 25 mm x 6 mm Ø, circular
4	664103 4	Beaker, DURAN, 250 ml, squat
1	665756 4	Measuring cylinder 500 ml, with plastic base
1	665755 4	Measuring cylinder 250 ml, with plastic base
1	665753 4	Measuring cylinder 50 ml, with plastic base
1	6677991	Analytical balance, 220 g : 0.0001 g
1	6045651 4	Spoon-ended spatula, Nickel, 120 mm, 20 mm
1	665793 4	Volumetric flask, Boro 3.3, 100 ml
1	665997 4	Graduated pipette 10 ml
1	666003 4	Pipetting ball (Peleus ball)
1	602347 4	Laboratory bottle, 500 ml, GL 45 thread
1	30011 4	Saddle base
1	30041 4	Stand rod, 25 cm, 12 mm Ø
1	666543 4	Double, crossed boss head, 0...16 mm
1	666555 4	Universal clamp 0...80 mm
1	661243 4	Wash bottle PE 500 ml
1	6731670 4	Malachite green, 25 g Danger H361d H302 H318 H410
1	6719720 4	Ethanol, denaturated, 1 l Danger H225 H319
1	6736800 4	Sodium hydroxide, pellets, 100 g Danger H314 H290
1	6753400 4	Water, pure, 1 l
1		additionally required: PC with Windows 7 or higher with WIFI or USB connection

Experiment Instructions

PDF (Experiment description)

C4.1.3.1 Reaction of malachite green with hydroxide ions

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Reaction of malachite green with hydroxide ions

Description

Components of equipment sets

Experiment Instructions

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