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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).
Kati
2 days
Maagizo
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.
Vifaa kwa hatua hii:
Bromidi ya Chuma100 g
Kabonati ya potasiamu (potashi)60 gZana zinazohitajika:
Maji
Kitambaa kikubwa cha pamba cha kuchuja
Chungu cha chuma cha kutupwa
Mizani ya mizani-mbili2
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.
Zana zinazohitajika:
Chungu cha chuma cha kutupwa
Karatasi ya litmasi
Glavu za mpira3
3
Boil and filter
Boil and filter
Boil for some time so the iron oxide settles dense, then filter it off.
Zana zinazohitajika:
Chungu cha chuma cha kutupwaKitambaa kikubwa cha pamba cha kuchuja4
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.
Zana zinazohitajika:
Chungu cha chuma cha kutupwaMajiKitambaa kikubwa cha pamba cha kuchuja5
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.
Zana zinazohitajika:
Chungu cha chuma cha kutupwa
Kipima-uzito wa majimaji
Sahani ya Kuvukizia6
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.
Zana zinazohitajika:
Sahani ya Kuvukizia
KipimajotoVifaa
2- 100 gKishikilia Nafasi
- Kishikilia Nafasi
Zana Zinazohitajika
9- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
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