Aşırı Doygunluk ve Anlık Kristallenme

Sodyum asetatta anlık kristal oluşumunu tetikleme

Crystallization Intermediate (High School) 35 dak ~$8,00

Hedef

Aşırı doygun sodyum asetat çözeltisi hazırlamak ve anlık kristallenmeyi tetiklemek; metastabil aşırı doygunluğu ve ekzotermik kristallenmeyi (sıcak buz) göstermek.

Arka Plan

Sodium acetate trihydrate can form extremely supersaturated solutions that remain liquid until disturbed. Adding a single seed crystal or scratching the container wall triggers rapid crystallization throughout the solution, releasing heat (exothermic). The resulting solid resembles ice but is warm to the touch.

Güvenlik Uyarıları

  • The solution gets hot when it crystallizes — handle with care
  • Sodium acetate is generally safe but avoid ingestion
  • Use heat-resistant gloves when handling hot solution

Gerekli KKD

goggles

Malzemeler

  • Sodium acetate trihydrate (100 g)
    Or make from vinegar + baking soda
  • Distilled water (10 mL)
    Minimal amount

Ekipman

250 mL beaker or flask Hot plate Stirring rod Thermometer

Prosedür

1

Add 100 g sodium acetate trihydrate and 10 mL water to the beaker. Heat while stirring until all crystals dissolve (about 70°C).

8 dak Handle hot solution carefully
2

Remove from heat and allow to cool to room temperature undisturbed. Do not shake or add anything.

15 dak
3

Once cooled, the solution should remain liquid despite being supersaturated. Measure the temperature.

2 dak
4

Drop a single small crystal of sodium acetate into the solution and observe the rapid crystallization wave.

2 dak
5

Immediately measure the temperature of the newly formed crystals. Note the temperature increase (exothermic).

2 dak Crystals will be warm
6

The process is reversible — reheat to dissolve and repeat.

5 dak

Beklenen Sonuçlar

When triggered, crystallization should sweep through the solution in seconds, forming a solid mass of warm crystals (hence "hot ice"). The temperature typically rises 10-20°C above room temperature. This is the principle behind reusable hand warmers.

Temizlik

Sodium acetate is reusable. Simply reheat to dissolve. Can be disposed down the drain. Rinse equipment.

Ayrıntılar

Kategori
Crystallization
Zorluk
Intermediate (High School)
Süre
35 dak
Tahmini Maliyet
$8,00
Adımlar
6
Malzemeler
2

Daha Fazla Deney

Bakır Sülfat Kristali Büyütme 30 min Benzoik Asidin Yeniden Kristallendirilmesi 45 min Bizmut Gökkuşağı Kristali Büyütme 45 min Salol (Fenil Salisilat) Kristallenmesi 30 min Şap Kristali Büyütme 30 min Şeker Kristali Akide Şekeri 25 min Tuz ve Kumun Kademeli Kristallenmesi 35 min

Frequently Asked Questions

What is the objective of Aşırı Doygunluk ve Anlık Kristallenme?
Aşırı doygun sodyum asetat çözeltisi hazırlamak ve anlık kristallenmeyi tetiklemek; metastabil aşırı doygunluğu ve ekzotermik kristallenmeyi (sıcak buz) göstermek.
How difficult is Aşırı Doygunluk ve Anlık Kristallenme?
This experiment is rated as Intermediate (High School). It takes approximately 35 minutes to complete.
What safety precautions are needed for Aşırı Doygunluk ve Anlık Kristallenme?
Key safety precautions include: The solution gets hot when it crystallizes — handle with care; Sodium acetate is generally safe but avoid ingestion; Use heat-resistant gloves when handling hot solution.
What materials are needed for Aşırı Doygunluk ve Anlık Kristallenme?
The main materials required are: Sodium acetate trihydrate, Distilled water.
What results should I expect from Aşırı Doygunluk ve Anlık Kristallenme?
When triggered, crystallization should sweep through the solution in seconds, forming a solid mass of warm crystals (hence "hot ice"). The temperature typically rises 10-20°C above room temperature. This is the principle behind reusable hand warmers.