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Precipitated Silver: Silver Chloride Reduced by Zinc in Acidulated Water (Thorpe 1913)
Fine silver powder without melting anything. Hydrochloric acid throws silver out of solution as white silver chloride. Zinc in slightly acid water then takes the chlorine away and leaves the silver as a grey powder.
Source: Thorpe, Dictionary of Applied Chemistry, vol. 4 (1913), Silver. Thorpe gives no amounts, times or end-point. Ours: a silver nitrate solution, zinc sheet strips, hydrochloric acid of the two acids he names, and the washing and drying. Picture drawn by Youblob.
Pemula
1 day
Instruksi
1
1
Dissolve silver nitrate in water
Dissolve silver nitrate in water
Ours: dissolve silver nitrate in distilled water as the silver solution. Silver nitrate stains and burns skin: gloves and goggles.
Material untuk langkah ini:
Perak Nitrat1 as required
Air Suling1 as requiredAlat yang dibutuhkan:
Gelas Piala Borosilikat
Batang Kaca Borosilikat
Sarung Tangan Nitril
Kacamata Pelindung Cipratan Kimia2
2
Throw down silver chloride with hydrochloric acid
Throw down silver chloride with hydrochloric acid
Add hydrochloric acid to the solution. White silver chloride falls. Ours: add it while it still makes a precipitate, let it settle and pour off the liquid.
Material untuk langkah ini:
Asam klorida1 as requiredAlat yang dibutuhkan:
Gelas Piala BorosilikatBatang Kaca BorosilikatSarung Tangan NitrilKacamata Pelindung Cipratan Kimia3
3
Reduce the chloride with zinc in acid water
Reduce the chloride with zinc in acid water
Cover the chloride with water made slightly acid with hydrochloric acid (Thorpe: hydrochloric or sulphuric) and put zinc in it. The zinc reduces the chloride to silver. Ours: strips of zinc sheet, left in until no white chloride is left. Time not given.
Material untuk langkah ini:
Lembaran seng1 as requiredAsam klorida1 as requiredAir Suling1 as requiredAlat yang dibutuhkan:
Gelas Piala BorosilikatBatang Kaca BorosilikatSarung Tangan NitrilKacamata Pelindung Cipratan Kimia4
4
Take out the zinc, wash and dry the silver
Take out the zinc, wash and dry the silver
Ours: lift out what is left of the zinc, wash the grey silver powder with water until the washings are no longer acid, filter, and dry it. Keep it in a closed jar.
Alat yang dibutuhkan:
Air Suling
Kertas Saring
Oven pengeringan
Stoples KacaBahan
4- 1 as requiredPlaceholder
- 2 as requiredPlaceholder
- 2 as requiredPlaceholder
- 1 as requiredPlaceholder
Alat yang Diperlukan
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