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Potassium Bromide: Iron Bromide and Potash
Potassium bromide is the bromide of photography. Thorpe (1913): iron bromide solution run into hot potash solution until it is just neutral throws down the iron as oxide and leaves potassium bromide in solution, which is filtered, evaporated and crystallised. 100 parts of iron bromide take 56 to 60 parts of potash.
The picture: potassium bromide crystals (Wikimedia Commons).
Katamtaman
2 days
Mga Tagubilin
1
1
Make the two solutions
Make the two solutions
Dissolve the iron bromide in water and filter it. Dissolve 56 to 60 g of potash, according to its purity, in a little water and heat it.
Mga materyales para sa hakbang na ito:
Iron Bromide100 g
Potassium carbonate (potas)60 gMga kailangang kasangkapan:
Tubig
Magaspang na telang bulak na pansala
Kaldero na kaeng bakal
Timbangang panimbang2
2
Run the iron bromide into the potash
Run the iron bromide into the potash
Pour the iron bromide solution into the hot potash until the liquid is exactly neutral or very faintly alkaline. Iron oxide falls out.
Mga kailangang kasangkapan:
Kaldero na kaeng bakal
Papel na litmus
Gwantes na goma3
3
Boil and filter
Boil and filter
Boil for some time so the iron oxide settles dense, then filter it off.
Mga kailangang kasangkapan:
Kaldero na kaeng bakalMagaspang na telang bulak na pansala4
4
Dry, then dissolve again
Dry, then dissolve again
Evaporate to dryness. Dissolve the residue again in water: potassium sulphate and other dirt stay behind. Filter.
Mga kailangang kasangkapan:
Kaldero na kaeng bakalTubigMagaspang na telang bulak na pansala5
5
Crystallise
Crystallise
Boil down to specific gravity 1.53, then evaporate further at a gentle heat in a stoneware or enamelled dish, for hard crystals.
Mga kailangang kasangkapan:
Kaldero na kaeng bakal
Hydrometer
Platong Pansingaw6
6
Dry at 40 to 50 °C
Dry at 40 to 50 °C
Dry the crystals at 40 to 50 °C, not above, or they crackle and burst.
Mga kailangang kasangkapan:
Platong Pansingaw
TermometroMga Materyales
2- 100 gPlaceholder
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Mga Kinakailangang Kasangkapan
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