Sodyum Asetatın Ekzotermik Kristallenmesi

Anlık kristallenme sırasında açığa çıkan ısıyı ölçme

Thermochemistry Intermediate (High School) 30 dak ~$8,00

Hedef

Aşırı doygun sodyum asetatın kristallenmesi sırasında kalorimetreyle açığa çıkan ısıyı ölçmek.

Arka Plan

When supersaturated sodium acetate crystallizes, it releases stored energy as heat. By triggering crystallization inside a calorimeter and measuring the temperature rise, the enthalpy of crystallization can be determined. This is the same principle used in reusable hand warmers.

Güvenlik Uyarıları

  • Hot solution during preparation
  • Crystallization releases heat — container gets warm

Gerekli KKD

goggles

Malzemeler

  • Sodium acetate trihydrate (80 g)
  • Distilled water (150 mL)

Ekipman

Polystyrene cup calorimeter Hot plate Thermometer Beaker (250 mL) Stirring rod

Prosedür

1

Dissolve 80 g sodium acetate trihydrate in 20 mL water by heating to about 70°C. Stir until clear.

8 dak Handle hot solution carefully
2

Pour the solution into the polystyrene cup calorimeter. Allow to cool undisturbed to room temperature.

15 dak
3

Record the temperature of the supersaturated solution.

1 dak
4

Add a single small crystal of sodium acetate to trigger crystallization. Immediately stir gently and record temperature every 15 seconds.

3 dak
5

Record the maximum temperature reached.

1 dak
6

Calculate the heat released: q = mcΔT. Determine ΔH of crystallization per mole.

5 dak

Beklenen Sonuçlar

Temperature should rise 15-25°C above room temperature. The enthalpy of crystallization is approximately -19.7 kJ/mol for sodium acetate trihydrate. Measured values should be within 20% of this.

Temizlik

The sodium acetate can be remelted and reused. Rinse the calorimeter. Non-toxic — can go down the drain.

Ayrıntılar

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

Daha Fazla Deney

Bomba Kalorimetresi Simülasyonu 45 min Buzun Erime Entalpisi 25 min Çözünme Her Zaman Ekzotermik Değildir 25 min Endotermik Tepkime Gösterisi 20 min Hess Yasasının Doğrulanması 60 min Kahve Kupası Kalorimetresi 40 min Magnezyumun Yanma Isısı 50 min Metallerin Özgül Isı Kapasitesi 40 min Soğuk Paket Kimyası 20 min

Frequently Asked Questions

What is the objective of Sodyum Asetatın Ekzotermik Kristallenmesi?
Aşırı doygun sodyum asetatın kristallenmesi sırasında kalorimetreyle açığa çıkan ısıyı ölçmek.
How difficult is Sodyum Asetatın Ekzotermik Kristallenmesi?
This experiment is rated as Intermediate (High School). It takes approximately 30 minutes to complete.
What safety precautions are needed for Sodyum Asetatın Ekzotermik Kristallenmesi?
Key safety precautions include: Hot solution during preparation; Crystallization releases heat — container gets warm.
What materials are needed for Sodyum Asetatın Ekzotermik Kristallenmesi?
The main materials required are: Sodium acetate trihydrate, Distilled water.
What results should I expect from Sodyum Asetatın Ekzotermik Kristallenmesi?
Temperature should rise 15-25°C above room temperature. The enthalpy of crystallization is approximately -19.7 kJ/mol for sodium acetate trihydrate. Measured values should be within 20% of this.