Tekanan Uap dan Titik Didih

Mengukur bagaimana tekanan uap berubah dengan suhu

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

Tujuan

Ukur tekanan uap air pada suhu berbeda dan verifikasi persamaan Clausius-Clapeyron.

Latar Belakang

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.

Peringatan Keselamatan

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

APD yang Diperlukan

goggles lab_coat

Bahan

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

Peralatan

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

Prosedur

1

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

5 menit Use vacuum-rated glassware only
2

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

5 menit
3

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

5 menit
4

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

15 menit
5

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

10 menit
6

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

5 menit

Hasil yang Diharapkan

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.

Pembersihan

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

Detail

Kategori
Gas Laws
Tingkat Kesulitan
Advanced (University)
Durasi
45 menit
Perkiraan Biaya
$12,00
Langkah
6
Bahan
2

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Frequently Asked Questions

What is the objective of Tekanan Uap dan Titik Didih?
Ukur tekanan uap air pada suhu berbeda dan verifikasi persamaan Clausius-Clapeyron.
How difficult is Tekanan Uap dan Titik Didih?
This experiment is rated as Advanced (University). It takes approximately 45 minutes to complete.
What safety precautions are needed for Tekanan Uap dan Titik Didih?
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 Tekanan Uap dan Titik Didih?
The main materials required are: Distilled water, Ice.
What results should I expect from Tekanan Uap dan Titik Didih?
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.