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Silver Oxide: Silver Nitrate Precipitated with Solution of Potassa (USP 1870)
Silver oxide is a heavy, dark brown powder, and heating it to about 250 °C leaves pure silver. Potash added to a silver nitrate solution throws it down, and washing leaves potassium nitrate behind in the water.
Source: US Pharmacopoeia 1870, as quoted in the US Dispensatory (1907), Argenti Oxidum. Not given here: the strength of the solution of potassa; ours: potassium hydroxide in distilled water. Silver nitrate stains and burns skin: gloves and goggles. Picture drawn by Youblob.
Olùbẹ̀rẹ̀
1 day
Ìlànà
1
1
Dissolve 4 troy oz silver nitrate in half a pint of water
Dissolve 4 troy oz silver nitrate in half a pint of water
Dissolve 4 troy ounces of silver nitrate in half a pint of distilled water. Silver nitrate stains and burns skin: gloves and goggles.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Silver Nitrate4 troy oz
Omi Àyọ́0.5 pintÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gba
Ago Bórósílíkéètì
Ọ̀pá Gíláàsì Borosilicate
Ìbọ̀wọ́ Nítírílì
Gílásì Ààbò Fún Ìfọ́n Kẹ́míkà2
2
Add solution of potassa while it still precipitates
Add solution of potassa while it still precipitates
Add solution of potassa, about a pint and a half or as much as needed, for as long as it still throws down a precipitate. Ours: potassium hydroxide dissolved in distilled water; the USP strength is not given here. Potash free of carbon dioxide keeps out silver carbonate.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Hidiroksidi potasiomu1 as requiredOmi Àyọ́1.5 pintÀwọn irinṣẹ́ tí a nílò:
Ago BórósílíkéètìỌ̀pá Gíláàsì BorosilicateÌbọ̀wọ́ NítírílìGílásì Ààbò Fún Ìfọ́n Kẹ́míkà3
3
Wash, dry and store in the dark
Wash, dry and store in the dark
Wash the precipitate again and again with water until the washings are almost tasteless. Dry it and keep it in a well-stoppered bottle away from light. Ours: filter paper, and a low oven, well below the 250 °C at which it breaks down to silver.
Àwọn irinṣẹ́ tí a nílò:
Bébà Ìsẹ́Omi Àyọ́
Ààrò ìgbẹ̀
Ìgò Gíláàsì Dúdú Onídìí Tí Kò Jẹ́ Afẹ́fẹ́ KọjáÀwọn ohun-èlò
3- 4 troy ozÀyè
- 2 pintÀyè
- 1 as requiredÀyè
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