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Benzoic Acid: Sublimed from Gum Benzoin into a Paper Cone at 170 °C (Mohr, after Thorpe 1912)
Gum benzoin, the fragrant resin of Styrax trees, holds benzoic acid that rises as a vapour when gently heated. Mohr's way lets it pass through filter paper into a paper cone, where it settles as crystals.
Result: colourless crystals of benzoic acid smelling slightly of vanilla, about 4 % of the gum.
Source: Thorpe, Dictionary of Applied Chemistry, vol. 1 (1912), Benzoic acid (Mohr, Annalen 29, 177). Picture drawn by Youblob.
Olùbẹ̀rẹ̀
4 hours
Ìlànà
1
1
Break the gum into small pieces
Break the gum into small pieces
Break gum benzoin into small pieces and put them in a flat iron vessel.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Gọ́ọ̀mù benzoin100 parts by weightÀwọn irinṣẹ́ tí a nílò:
Odó àti Ọmọ Odó
Àwokòtò irin ìdà2
2
Paste filter paper over it and tie on a paper cone
Paste filter paper over it and tie on a paper cone
Paste filter paper over the mouth of the vessel. Over it place a large conical cap of strong paper that fits the vessel exactly, and tie it round the rim.
Àwọn irinṣẹ́ tí a nílò:
Bébà Ìsẹ́
Ìdì ìwé kraft (aláwọ̀ dúdú-pupa)
Okùn Òwú3
3
Heat gently on a sand bath at about 170 °C
Heat gently on a sand bath at about 170 °C
Heat gently over a sand bath at about 170 °C. The benzoic acid sublimes through the filter paper and collects as crystals inside the cone. A pound of acid takes three to four hours.
Àwọn irinṣẹ́ tí a nílò:
Ìwẹ̀ yanrìn
Ẹ̀rọ Ìwọ̀n Ooru4
4
Take the crystals out of the cone
Take the crystals out of the cone
At the end, remove the colourless crystals from the paper cone. The yield is about 4 % of the gum. Ours: keep them in a closed jar.
Àwọn irinṣẹ́ tí a nílò:
Ìgò Gílásì OnídìíÀwọn ohun-èlò
1- 100 parts by weightÀyè
Àwọn irinṣẹ́ tó nílò
8- Àyè
- Àyè
- Àyè
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