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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.
初学者
1 day
说明
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.
此步骤所需材料：
硝酸银1 as required
蒸馏水1 as required所需工具：
硼硅玻璃烧杯
硼硅玻璃棒
丁腈手套
化学防溅护目镜2
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.
此步骤所需材料：
盐酸1 as required所需工具：
硼硅玻璃烧杯硼硅玻璃棒丁腈手套化学防溅护目镜3
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.
此步骤所需材料：
锌板1 as required盐酸1 as required蒸馏水1 as required所需工具：
硼硅玻璃烧杯硼硅玻璃棒丁腈手套化学防溅护目镜4
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.
所需工具：
蒸馏水
滤纸
干燥炉
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