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.

初学者

1 day

说明

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.

此步骤所需材料：

硝酸银4 troy oz

蒸馏水0.5 pint

所需工具：

等臂天平

硼硅玻璃烧杯

硼硅玻璃棒

丁腈手套

化学防溅护目镜

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.

此步骤所需材料：

氢氧化钾1 as required

蒸馏水1.5 pint

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

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.

所需工具：