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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).
Ophakathi
2 days
Imiyalelo
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.
Izinto zokwakha zalesi sinyathelo:
I-Iron Bromide100 g
I-potassium carbonate (i-potash)60 gAmathuluzi adingekayo:
Amanzi
Indwangu kakotini ebanzi yokuhluza
Ibhodwe lensimbi ethelwe
Isikali sesilinganiso2
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.
Amathuluzi adingekayo:
Ibhodwe lensimbi ethelwe
Iphepha le-litmus
Amagilavu erabha3
3
Boil and filter
Boil and filter
Boil for some time so the iron oxide settles dense, then filter it off.
Amathuluzi adingekayo:
Ibhodwe lensimbi ethelweIndwangu kakotini ebanzi yokuhluza4
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.
Amathuluzi adingekayo:
Ibhodwe lensimbi ethelweAmanziIndwangu kakotini ebanzi yokuhluza5
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.
Amathuluzi adingekayo:
Ibhodwe lensimbi ethelwe
I-hydrometer
Ipuleti Lokuhwamuka6
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.
Amathuluzi adingekayo:
Ipuleti Lokuhwamuka
IthemomithaIzinto
2- 100 gIsibambeli
- Isibambeli
Amathuluzi Adingekayo
9- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
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