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Sodium Thiosulfate: Soda and Sulphur Fusion (Thorpe, 1913)
A small batch of 'hypo' (photographic fixer) from soda and sulphur: dry sodium carbonate is fused with a third of its weight of flowers of sulphur in an open porcelain basin, stirred so air reaches every part, then dissolved, boiled with more sulphur and crystallised.
The sodium sulphide formed first takes up oxygen from the air and turns, with a faint glow, into thiosulphate.
Source: T. E. Thorpe, Dictionary of Applied Chemistry vol. V (1913), p. 29. Picture: the book's text.
Kati
Unknown
Maagizo
1
1
Mix soda and sulphur
Mix soda and sulphur
Weigh about 1 lb of pure, well-dried sodium carbonate and mix it with about one-third its weight of flowers of sulphur.
Vifaa kwa hatua hii:
Kabonati ya Sodiamu (Majivu ya Soda)1 about 1 lb, well dried
Unga wa sulfuri1 about 1/3 the weight of sodaZana zinazohitajika:
Mizani ya dijitali ya usahihi2
2
Fuse in the open basin
Fuse in the open basin
Heat the mixture in a porcelain basin to the melting point of sulphur for some time, stirring well all the while so every part meets the air. The sulphide formed absorbs oxygen and turns, with a feeble glow, into sodium thiosulphate.
Zana zinazohitajika:
Sahani ya Kuvukizia
Kichomeo cha Bunsen
Fimbo ya Kioo ya Kukoroga3
3
Dissolve, boil and crystallise
Dissolve, boil and crystallise
When cold, dissolve the mass in water, boil it with sulphur for some time, and concentrate the liquid by evaporation to the crystallising point. A very pure product can be had this way.
Vifaa kwa hatua hii:
Maji1 kipandeUnga wa sulfuri1 kipandeZana zinazohitajika:
Sahani ya KuvukiziaKichomeo cha BunsenFimbo ya Kioo ya KukorogaVifaa
3- 1 about 1 lb, well driedKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
Zana Zinazohitajika
4- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
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