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Hydrogen Peroxide 10 %: the 3 % Solution Evaporated in Air at 75 °C, Checked with Permanganate (Thorpe 1912)
Water evaporates faster than hydrogen peroxide, so warming a weak solution in open air makes it stronger. Thorpe gives 75 °C for this first stage; we stop at 10 %, checking the strength with permanganate.
Result: hydrogen peroxide of about 10 %.
Source: Thorpe, Dictionary of Applied Chemistry, vol. 3 (1912), Hydrogen peroxide. Thorpe takes it on to 20 %; stopping at 10 % is ours. Danger: 10 % peroxide burns skin and eyes. Picture drawn by Youblob.
中级
1 day
说明
1
1
Evaporate the 3 % solution in air at 75 °C
Evaporate the 3 % solution in air at 75 °C
Warm 3 % hydrogen peroxide in an open dish at 75 °C so the water evaporates. Thorpe goes on to 20 %; ours: stop near 10 %, about a third of the starting volume. Wear goggles and gloves.
此步骤所需材料：
过氧化氢（3 %）1 as required所需工具：
蒸发皿
水浴
实验室温度计
化学防溅护目镜
橡胶手套2
2
Check the strength with permanganate
Check the strength with permanganate
Titrate 2 c.c. in a 35 c.c. graduated tube with 5-6 drops of hydrochloric acid and a solution of 7.9 g potassium permanganate per litre until it turns red or brownish; 5 c.c. means 1 %. Ours for 10 %: dilute 1 c.c. to 2 c.c. first, so 25 c.c. means 10 %.
所需工具：
高锰酸钾——KMnO4
盐酸
蒸馏水
滴定管（玻璃）
带刻度移液管（莫尔式）3
3
Store it cool and dark
Store it cool and dark
Ours: keep the 10 % solution in a cool, dark bottle; it slowly loses strength.
所需工具：
琥珀色玻璃瓶此蓝图制作
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