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Technical data


The detection of sulphur

Article no: P7170500
Principle

On melting, sodium carbonate decomposes and thereby reacts with the sulphur present in organic substances under the formation of brown coloured sodium polysulphides. The colour of these polysulphides is similar to that of liver, and this is the basis for the name "Hepar test", Hepar being Greek for liver. Soluble polysulphides form silver sulphide spontaneously with  metallic silver. Proteins with a high content of cysteine or methionine are particularly rich in sulphur. These include the vegetable proteins in the fruits of leguminous plants.

Learning objectives

  • Many organic substances, proteins in particular, contain sulphur.
  • Sulphur can be detected as silver sulphide (Hepar test).

Benefits

  • Easy teaching and efficient learning by using interactive experimentation PHYWE-Software
  • Experiment is part of a complete solution set with experiments for the topic Organic Chemistry matched with international curriculum: all topics are covered

 

Scope of delivery

Spoon, special steel 33398-00 1
Wash bottle, 250 ml, plastic 33930-00 1
Test tube,180x22 mm, PN19 MAU-17080101 1
Test tube brush w. wool tip,d20mm 38762-00 1
Test tube rack, wood, for 6 tubes d= 22mm MAU-20042200 1
Test tube holder, up to d 22mm 38823-00 1
Protecting glasses, clear glass 39316-00 1
Glass rod, boro 3.3, l=200mm, d=6mm 40485-04 1
Pipette with rubber bulb 64701-00 1
Sodium carbonate, anhyd. 1000 g 30154-70 1
Casein, alkali-soluble 100 g 31188-10 1
Water, distilled 5 l 31246-81 1
Butane burner with cartridge, 220 g 32180-00 1
Silver foil, 150 x150 x 0.1 mm, 25g 31839-04 1

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Robert-Bosch-Breite 10 – 37079 Göttingen – Germany
www.phywe.com