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Hydrogen Peroxide 10 %: the 3 % Solution Evaporated in Air at 75 °C, Checked with Permanganate (Thorpe 1912)
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30. Oktoba 2026DE
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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.
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Maagizo

1

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.

Vifaa kwa hatua hii:

Peroksidi ya hidrojeni (3 %)Peroksidi ya hidrojeni (3 %)1 as required

Zana zinazohitajika:

Sahani ya KuvukiziaSahani ya Kuvukizia
Bafu la MajiBafu la Maji
Kipimajoto cha maabaraKipimajoto cha maabara
Miwani ya kinga dhidi ya kemikaliMiwani ya kinga dhidi ya kemikali
Glavu za mpiraGlavu za mpira
2

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 %.

Zana zinazohitajika:

Pamanganati ya potasiamu — KMnO4Pamanganati ya potasiamu — KMnO4
Asidi hidroklorikiAsidi hidrokloriki
Maji yaliyosafishwa kwa mvukeMaji yaliyosafishwa kwa mvuke
Bureti (ya kioo)Bureti (ya kioo)
Pipeti iliyodarajwa (ya Mohr)Pipeti iliyodarajwa (ya Mohr)
3

Store it cool and dark

Ours: keep the 10 % solution in a cool, dark bottle; it slowly loses strength.

Zana zinazohitajika:

Chupa ya kioo cha kahawiaChupa ya kioo cha kahawia

Vifaa

1

Zana Zinazohitajika

11

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Peroksidi ya hidrojeni (10%)

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Hydrogen Peroxide 3 %: Barium Peroxide in Dilute Sulphuric Acid

Hydrogen Peroxide 3 %: Barium Peroxide in Dilute Sulphuric Acid

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