Synthesis of orange II

LC4.5.1.2

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Description

In this experiment, the students synthesise and study the azo dye Orange II, also known as pH indicator. Having previously dealt with azo dyes in class is assumed in the experimental evaluation. You can provide the structural formulae of sulphanilic acid and 2-naphthol to the students if necessary.

Components of equipment sets

1	665212 4	Glass stirring rod 200 x 8 mm Ø
1	665997 4	Graduated pipette 10 ml
1	666003 4	Pipetting ball (Peleus ball)
1	6659531 4	Dropping pipette 150 mm x 7 mm Ø
1	6659541 8	Dropper bulb
1	6045682 4	Powder spatula, steel, 185 mm
1	664183 4	Petri dish, 100 x 20 mm, glass
1	602022 4	Beaker Boro 3.3, 100 ml, squat
1	610010 8	Laboratory safety goggles
1	667609 4	Safety gloves, nitrile rubber, size 8
1	ADACB501 4	Compact scale 500 g : 0.1 g
1	6734510 4	2-Naphthol, 100 g Warning H332 H302 H400
1	6749710 4	Sulphanilic acid, 50 g Warning H315 H319 H317
1	6737100 4	Sodium nitrite, 50 g Danger H272 H301 H400
1	6719550 4	Acetic acid, dil., approx. 2 mol/l, 500 ml Warning H315 H319 H290
1	6719720 4	Ethanol, denaturated, 1 l Danger H225 H319
1	6738420 4	Sodium hydroxide solution, 1 mol/l, 500 ml Danger H314 H290
1	6753410 4	Water, pure, 5 l

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Synthesis of orange II

Description

Components of equipment sets

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