Fil Diş Macunu

Hidrojen peroksidi hızla katalitik bozundurarak devasa bir köpük sütunu oluşturma

Classroom Demonstrations Beginner (Middle School) 20 dak ~$10,00

Hedef

Potasyum iyodür kullanarak hidrojen peroksidin katalitik bozunumunu göstermek; kataliz, ekzotermik tepkimeler ve gaz oluşumu kavramlarını açıklamak.

Arka Plan

Elephant toothpaste is one of the most popular chemistry demonstrations. Concentrated hydrogen peroxide (H₂O₂) is decomposed rapidly by a potassium iodide (KI) catalyst, releasing oxygen gas and steam. When performed in a narrow-neck flask with dish soap, the oxygen gas creates a towering column of foam that erupts like giant toothpaste. The reaction is exothermic, and the foam is warm to the touch. The iodide ion acts as a catalyst by cycling between I⁻ and IO⁻ intermediates.

Güvenlik Uyarıları

  • 30% H₂O₂ causes severe skin burns and eye damage
  • Wear face shield and heavy-duty gloves
  • Do not stand over the flask when adding KI
  • The foam is hot — do not touch immediately
  • Perform behind a safety shield

Gerekli KKD

goggles gloves lab_coat face_shield

Malzemeler

  • Hydrogen peroxide (30%) (50 mL)
    30% concentration required for dramatic effect
  • Potassium iodide (KI) (10 g)
    Dissolved in 25 mL water
  • Liquid dish soap (15 mL)
  • Food coloring (5 drops)
    Optional, for visual effect
  • Large tray or bin (1)
    To catch overflow

Ekipman

Erlenmeyer flask (1 L, narrow neck) Measuring cylinder Safety shield or splash guard Funnel

Prosedür

1

Place the Erlenmeyer flask on the large tray. Set up the safety shield.

2 dak Ensure audience is at safe distance
2

Carefully pour 50 mL of 30% H₂O₂ into the flask.

2 dak 30% H₂O₂ is extremely corrosive
3

Add 15 mL of dish soap and a few drops of food coloring. Swirl gently to mix.

2 dak
4

Dissolve 10 g of KI in 25 mL of warm water. Pour this solution into the flask using a funnel and step back immediately.

2 dak Step back immediately after adding
5

Observe the rapid evolution of foam. The reaction is complete in seconds. Discuss the role of KI as a catalyst.

5 dak
6

After the foam cools, students may touch it (with gloves). It contains only water, oxygen, soap, and KI — no H₂O₂ remains.

5 dak Wait until foam is cool

Beklenen Sonuçlar

A dramatic eruption of warm, colored foam that rises 1–2 meters above the flask. Steam may be visible. The reaction demonstrates catalysis (KI is not consumed), exothermic processes, and gas evolution (O₂).

Temizlik

The foam is non-toxic (soap, water, KI). Rinse down the drain with plenty of water. Clean the flask and tray.

Ayrıntılar

Kategori
Classroom Demonstrations
Zorluk
Beginner (Middle School)
Süre
20 dak
Tahmini Maliyet
$10,00
Adımlar
6
Malzemeler
5

Daha Fazla Deney

Anlık Donma: Aşırı Soğutulmuş Su 120 min İyot Saati Tepkimesi 45 min Kaybolan Beher (Kırılma İndisi Eşleşmesi) 15 min Kuru Buzda Magnezyum Yanması 25 min Luminolle Kemilüminesans 30 min Newton-Dışı Akışkan: Oobleck 20 min Salınan Briggs-Rauscher Tepkimesi 40 min Sodyum ve Su Tepkimesi 25 min Termit Tepkimesi 30 min Yoğunluk Sütunu Gökkuşağı 30 min

Frequently Asked Questions

What is the objective of Fil Diş Macunu?
Potasyum iyodür kullanarak hidrojen peroksidin katalitik bozunumunu göstermek; kataliz, ekzotermik tepkimeler ve gaz oluşumu kavramlarını açıklamak.
How difficult is Fil Diş Macunu?
This experiment is rated as Beginner (Middle School). It takes approximately 20 minutes to complete.
What safety precautions are needed for Fil Diş Macunu?
Key safety precautions include: 30% H₂O₂ causes severe skin burns and eye damage; Wear face shield and heavy-duty gloves; Do not stand over the flask when adding KI.
What materials are needed for Fil Diş Macunu?
The main materials required are: Hydrogen peroxide (30%), Potassium iodide (KI), Liquid dish soap, Food coloring, Large tray or bin.
What results should I expect from Fil Diş Macunu?
A dramatic eruption of warm, colored foam that rises 1–2 meters above the flask. Steam may be visible. The reaction demonstrates catalysis (KI is not consumed), exothermic processes, and gas evolution (O₂).