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Hydrogen Peroxide 3 %: Barium Peroxide in Dilute Sulphuric Acid
Thénard first made hydrogen peroxide from barium peroxide; the improved way stirs the peroxide into sulphuric acid, which takes the barium out as insoluble barium sulphate. Titrate the clear liquid with permanganate to find its strength, dilute it to 3 %, the mild antiseptic and bleach, and keep it in a dark bottle. Even 3 % hurts the eyes.
The picture: our diagram of the four stages.
高级
A day
说明
1
1
Peroxide into cold acid
Peroxide into cold acid
Grind the barium peroxide to a paste with a little cold water. Stand a beaker of dilute sulphuric acid in ice and stir the paste in a little at a time. Stop while a drop of the liquid still turns blue litmus red: it keeps better slightly acid.
此步骤所需材料：
过氧化钡150 克
稀硫酸1 升所需工具：
研钵与研杵
等臂天平
硼硅玻璃烧杯
大汤锅
冰块
玻璃搅拌棒
石蕊试纸
化学防溅护目镜
橡胶手套2
2
Filter
Filter
Let the white barium sulphate settle and filter it off. The clear liquid is hydrogen peroxide in water.
所需工具：
带颈玻璃漏斗
滤纸硼硅玻璃烧杯化学防溅护目镜橡胶手套3
3
Titrate a sample
Titrate a sample
Dissolve 3.161 g of permanganate to 1 litre in a volumetric flask. Pipette 1 mL of the peroxide into a flask with some dilute sulphuric acid and run permanganate in from the burette until the first lasting pink. Note the reading (step 5).
所需工具：
高锰酸钾——KMnO4
容量瓶
带刻度移液管（莫尔式）
锥形瓶
滴定管（玻璃）
实验室夹（滴定管/烧瓶）稀硫酸化学防溅护目镜橡胶手套4
4
Dilute and bottle
Dilute and bottle
Weigh the batch, stir in the distilled water the notebook gives, and keep it cool in a dark, closed bottle.
此步骤所需材料：
蒸馏水0.1 升所需工具：
等臂天平玻璃搅拌棒
琥珀色玻璃瓶化学防溅护目镜橡胶手套5
5
Strength and dilution
Strength and dilution
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