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Colloidal Silver: Carey Lea's Soluble Silver from Silver Nitrate
Carey Lea found in 1891 that silver nitrate reduced by ferrous sulphate in the presence of sodium citrate gives a silver that dissolves in water with a deep red colour. The 1907 US Dispensatory gives the recipe: the mixed iron and citrate solutions poured into 10 % silver nitrate, the precipitate washed by redissolving it in water and throwing it down again with absolute alcohol. Dried, it is a bluish-green mass of about 97 % silver. Salt solutions precipitate it, so use distilled water only.
The picture: our diagram.
中级
2 days
说明
1
1
Make the three solutions
Make the three solutions
Dissolve 10 g of silver nitrate in distilled water to 100 ml (10 %). Separately dissolve 30 g of ferrous sulphate in 100 ml of water and 36 g of crystallised sodium citrate in 140 ml of water, then mix these two.
此步骤所需材料：
硝酸银10 克
硫酸亚铁30 克
柠檬酸钠36 克
蒸馏水340 毫升所需工具：
等臂天平
量筒
带盖玻璃罐
玻璃搅拌棒
丁腈手套2
2
Pour and stir
Pour and stir
Pour the iron-citrate mixture into the silver nitrate solution, stirring all the time. A dark precipitate forms.
所需工具：
玻璃搅拌棒带盖玻璃罐丁腈手套3
3
Settle and wash with alcohol
Settle and wash with alcohol
Let it settle and pour off the liquid. Dissolve the precipitate in a little distilled water and throw it down again with absolute alcohol. Pour off the alcohol.
所需工具：
无水酒精蒸馏水带盖玻璃罐玻璃搅拌棒4
4
Dry
Dry
Dry the precipitate in a dish at room temperature. It becomes a bluish or greenish mass.
所需工具：
蒸发皿5
5
Make the 1 % solution
Make the 1 % solution
Dissolve the dried silver in distilled water at 1 g to 100 ml. It dissolves deep red. Keep it in a stoppered bottle and do not mix it with salt water.
此步骤所需材料：
蒸馏水500 毫升所需工具：
等臂天平
带塞玻璃瓶此蓝图制作
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