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English
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.
Principiante
1 day
Istruzioni
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.
Materiali per questo passaggio:
Nitrato d'argento1 as required
Acqua distillata1 as requiredStrumenti necessari:
Becher in borosilicato
Bacchetta in vetro borosilicato
Guanti in nitrile
Occhiali antispruzzo chimico2
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.
Materiali per questo passaggio:
Acido cloridrico1 as requiredStrumenti necessari:
Becher in borosilicatoBacchetta in vetro borosilicatoGuanti in nitrileOcchiali antispruzzo chimico3
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.
Materiali per questo passaggio:
Lamiera di zinco1 as requiredAcido cloridrico1 as requiredAcqua distillata1 as requiredStrumenti necessari:
Becher in borosilicatoBacchetta in vetro borosilicatoGuanti in nitrileOcchiali antispruzzo chimico4
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.
Strumenti necessari:
Acqua distillata
Carta da filtro
Essiccatoio
Barattolo di vetroMateriali
4- 1 as requiredSegnaposto
- 2 as requiredSegnaposto
- 2 as requiredSegnaposto
- 1 as requiredSegnaposto
Strumenti richiesti
8- Segnaposto
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