हाथी टूथपेस्ट

हाइड्रोजन पेरॉक्साइड का तीव्र उत्प्रेरक अपघटन एक विशाल झाग स्तंभ उत्पन्न करता है

Classroom Demonstrations Beginner (Middle School) 20 मिनट ~$10.00

उद्देश्य

उत्प्रेरण, ऊष्माक्षेपी अभिक्रियाओं और गैस उत्सर्जन की अवधारणाओं को स्पष्ट करते हुए, पोटेशियम आयोडाइड का उपयोग करके हाइड्रोजन पेरॉक्साइड के उत्प्रेरक अपघटन का प्रदर्शन करें।

पृष्ठभूमि

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.

सुरक्षा चेतावनियाँ

  • 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

आवश्यक PPE

goggles gloves lab_coat face_shield

सामग्री

  • 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

उपकरण

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

प्रक्रिया

1

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

2 मिनट Ensure audience is at safe distance
2

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

2 मिनट 30% H₂O₂ is extremely corrosive
3

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

2 मिनट
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 मिनट 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 मिनट
6

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

5 मिनट Wait until foam is cool

अपेक्षित परिणाम

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).

सफाई

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

विवरण

श्रेणी
Classroom Demonstrations
कठिनाई
Beginner (Middle School)
अवधि
20 मिनट
अनुमानित लागत
$10.00
चरण
6
सामग्री
5

अधिक प्रयोग

आयोडीन घड़ी अभिक्रिया 45 min गायब होता बीकर (अपवर्तनांक मिलान) 15 min गैर-न्यूटोनियन तरल: ऊब्लेक 20 min घनत्व स्तंभ इंद्रधनुष 30 min तात्कालिक ठंड: अतिशीतित जल 120 min थर्माइट अभिक्रिया 30 min दोलनशील ब्रिग्स-राउशर अभिक्रिया 40 min ल्यूमिनॉल के साथ केमिल्यूमिनेसेंस 30 min सूखी बर्फ में मैग्नीशियम जलाना 25 min सोडियम और पानी की अभिक्रिया 25 min

Frequently Asked Questions

What is the objective of हाथी टूथपेस्ट?
उत्प्रेरण, ऊष्माक्षेपी अभिक्रियाओं और गैस उत्सर्जन की अवधारणाओं को स्पष्ट करते हुए, पोटेशियम आयोडाइड का उपयोग करके हाइड्रोजन पेरॉक्साइड के उत्प्रेरक अपघटन का प्रदर्शन करें।
How difficult is हाथी टूथपेस्ट?
This experiment is rated as Beginner (Middle School). It takes approximately 20 minutes to complete.
What safety precautions are needed for हाथी टूथपेस्ट?
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 हाथी टूथपेस्ट?
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 हाथी टूथपेस्ट?
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).