Buhar Basıncı ve Kaynama Noktası

Buhar basıncının sıcaklıkla nasıl değiştiğini ölçme

Gas Laws Advanced (University) 45 dak ~$12,00

Hedef

Suyun farklı sıcaklıklardaki buhar basıncını ölçmek ve Clausius-Clapeyron denklemini doğrulamak.

Arka Plan

The vapor pressure of a liquid increases exponentially with temperature. By measuring the temperature at which water boils under different reduced pressures (or measuring vapor pressure at different temperatures), the enthalpy of vaporization can be determined from the Clausius-Clapeyron equation.

Güvenlik Uyarıları

  • Handle vacuum apparatus carefully — implosion risk with glass
  • Hot water can cause burns
  • Use proper vacuum-rated glassware only

Gerekli KKD

goggles lab_coat

Malzemeler

  • Distilled water (200 mL)
  • Ice (500 g)
    For cold water bath

Ekipman

Round-bottom flask (500 mL) Vacuum pump or syringe Pressure gauge or manometer Thermometer Hot plate Rubber tubing Graph paper

Prosedür

1

Set up the flask with water, thermometer, and pressure gauge. Connect to the vacuum pump.

5 dak Use vacuum-rated glassware only
2

Heat the water to 80°C. Record the temperature and vapor pressure.

5 dak
3

Reduce pressure with the vacuum pump. Note the temperature at which boiling begins.

5 dak
4

Record at least 8 temperature-pressure data points from 40°C to 100°C.

15 dak
5

Plot ln(P) vs 1/T(K). The slope = -ΔHvap/R.

10 dak
6

Calculate ΔHvap from the slope. Compare with the literature value of 40.7 kJ/mol.

5 dak

Beklenen Sonuçlar

The ln(P) vs 1/T plot should be linear with a negative slope. The calculated ΔHvap should be approximately 40-44 kJ/mol, close to the accepted value of 40.7 kJ/mol for water.

Temizlik

Release vacuum slowly. Turn off heater. Drain water and dry apparatus.

Ayrıntılar

Kategori
Gas Laws
Zorluk
Advanced (University)
Süre
45 dak
Tahmini Maliyet
$12,00
Adımlar
6
Malzemeler
2

Daha Fazla Deney

Balonla Charles Yasası 30 min Boyle Yasasının Doğrulanması 40 min CO₂ ve Kireç Suyu Testi 20 min Difüzyon Hızı Karşılaştırması (Graham Yasası) 30 min Hidrojen Gazı Toplama 35 min Kartezyen Dalgıcı 15 min Magnezyumlu Gaz Stokiyometrisi 40 min STP'de Gazın Molar Hacmi 35 min

Frequently Asked Questions

What is the objective of Buhar Basıncı ve Kaynama Noktası?
Suyun farklı sıcaklıklardaki buhar basıncını ölçmek ve Clausius-Clapeyron denklemini doğrulamak.
How difficult is Buhar Basıncı ve Kaynama Noktası?
This experiment is rated as Advanced (University). It takes approximately 45 minutes to complete.
What safety precautions are needed for Buhar Basıncı ve Kaynama Noktası?
Key safety precautions include: Handle vacuum apparatus carefully — implosion risk with glass; Hot water can cause burns; Use proper vacuum-rated glassware only.
What materials are needed for Buhar Basıncı ve Kaynama Noktası?
The main materials required are: Distilled water, Ice.
What results should I expect from Buhar Basıncı ve Kaynama Noktası?
The ln(P) vs 1/T plot should be linear with a negative slope. The calculated ΔHvap should be approximately 40-44 kJ/mol, close to the accepted value of 40.7 kJ/mol for water.