experimental report

Determination of saturated vapor pressure of liquids

Experimenter: He Guangtao Experimental time: 2000.4.3 Temperature: 22.2 degrees Celsius Atmospheric pressure: 101.1Pa The purpose of the experiment is to define the definition of pure liquid saturated vapor pressure and the concept of gas-liquid two-phase equilibrium, to understand the relationship between pure liquid saturated vapor pressure and temperature - Crow The Xius-Clapeyron equation uses an isobarator to determine the saturated vapor pressure of cyclohexane at different temperatures. Initially grasp the vacuum test technology society to use the graphic method to find the average molar heat of vaporization and normal boiling point of the measured liquid in the experimental temperature range.

Instruments and reagents

Data record

Room temperature: 22.2 °C

Atmospheric pressure p0: 101.2, 101.2, 101.1, 101.1 kPa

At the atmospheric pressure, the boiling point is: 76.00

Experimental discussion

A pressure and temperature measurement has a random error, try to derive the error transfer expression of H.

Solution: H=U+PV

→ dH=dU+PdV+VdP

→ dH=v dT+TdV+pdV+Vdp

→ ΔVHm=VΔT+VΔp

Second, with this device, it is convenient to study various liquids such as benzene, dichloroethylene, carbon tetrachloride, water, n-propanol, isopropanol, acetone, and ethanol. Many of these liquids are flammable. What should I pay attention to when heating?

Answer: When heating, the flammable object should not be too close to the heater. When taking the flammable object, avoid sprinkling it on the heater. When using these drugs, cover it.